1 /******************************************************************************
5 ******************************************************************************/
7 /* Make assumptions about parameters which we will use for the tests */
9 (kill(all),declare(n,integer, k,real),assume(s>0,n>0, k>0),'done);
12 /******************************************************************************
13 First part: A&S 29.3.1 to 29.3.33
15 Problem 2: A&S: 29.3.1 OK
16 ******************************************************************************/
21 /*****************************************************************************
22 Problem 3: A&S: 29.3.2 OK
23 ******************************************************************************/
25 specint(%e^(-s*t)*t,t);
28 /*****************************************************************************
29 Problem 4: A&S: 29.3.3 OK
30 ******************************************************************************/
32 specint(%e^(-s*t)*t^(n-1)/gamma(n),t); /* use gamma(n) instead of (n-1)! */
35 /*****************************************************************************
36 Problem 5: A&S: 29.3.4 OK
37 ******************************************************************************/
39 specint(%e^(-s*t)/sqrt(%pi*t),t);
42 /*****************************************************************************
43 Problem 6: A&S: 29.3.5 OK
44 ******************************************************************************/
46 specint(%e^(-s*t)*2*sqrt(t/%pi),t);
49 /*****************************************************************************
50 Problem 7-10: A&S: 29.3.6 OK
51 ******************************************************************************/
53 /* Define the function to be integrated */
55 f(n,t):= 2^n*t^(n-1/2)/(product(2*k-1,k,1,n)*sqrt(%pi));
56 f(n,t):= 2^n*t^(n-1/2)/(product(2*k-1,k,1,n)*sqrt(%pi));
58 /* Test for 3 values of n.
59 Can Maxima find the general solution, too? */
61 specint(%e^(-s*t)*f(3,t),t);
64 specint(%e^(-s*t)*f(7,t),t);
67 specint(%e^(-s*t)*f(100,t),t);
70 /*****************************************************************************
71 Problem 11: A&S: 29.3.7 OK
72 ******************************************************************************/
74 specint(%e^(-s*t)*t^(k-1),t);
77 /*****************************************************************************
78 Problem 12: A&S: 29.3.8 OK
79 ******************************************************************************/
81 (assume(s+a>0), specint(%e^(-s*t)*%e^(-a*t),t));
84 /*****************************************************************************
85 Problem 13: A&S: 29.3.9 OK
86 ******************************************************************************/
88 specint(%e^(-s*t)*t*%e^(-a*t),t);
91 /*****************************************************************************
92 Problem 14: A&S: 29.3.10 OK
93 ******************************************************************************/
95 specint(%e^(-s*t)*t^(n-1)*%e^(-a*t)/gamma(n),t);
98 /*****************************************************************************
99 Problem 15: A&S: 29.3.11 OK
100 ******************************************************************************/
102 specint(%e^(-s*t)*t^(k-1)*%e^(-a*t),t);
105 /*****************************************************************************
106 Problem 16: A&S: 29.3.12 OK New
107 No solution with the original code because of the denominator.
108 ******************************************************************************/
110 (assume(s+b>0), factor(specint(%e^(-s*t)*(%e^(-a*t)-%e^(-b*t))/(b-a),t)));
113 /*****************************************************************************
114 Problem 17: A&S: 29.3.13 OK New
115 No solution with the original code because of the denominator.
116 ******************************************************************************/
118 factor(specint(%e^(-s*t)*(a*%e^(-a*t)-b*%e^(-b*t))/(a-b),t));
121 /*****************************************************************************
122 Problem 18: A&S: 29.3.14 OK New
123 No solution with the original code because of the denominator.
124 ******************************************************************************/
127 factor(specint(%e^(-s*t)*((b-c)*%e^(-a*t)+(c-a)*%e^(-b*t)+(a-b)*%e^(-c*t))/((b-a)*(b-c)*(c-a)),t)));
128 1/((s+a)*(s+b)*(s+c));
130 /*****************************************************************************
131 Problem 19: A&S: 29.3.15 OK
132 ******************************************************************************/
134 ratsimp(specint(%e^(-s*t)*sin(a*t)/a,t));
137 /*****************************************************************************
138 Problem 20: A&S: 29.3.16 OK
139 ******************************************************************************/
141 ratsimp(specint(%e^(-s*t)*cos(a*t),t));
144 /*****************************************************************************
145 Problem 21: A&S: 29.3.17 OK
146 ******************************************************************************/
148 (assume(s-a>0),ratsimp(specint(%e^(-s*t)*sinh(a*t)/a,t)));
151 /*****************************************************************************
152 Problem 22: A&S: 29.3.18 OK
153 ******************************************************************************/
155 ratsimp(specint(%e^(-s*t)*cosh(a*t),t));
158 /*****************************************************************************
159 Problem 23: A&S: 29.3.19 OK
160 ******************************************************************************/
162 factor(ratsimp(specint(%e^(-s*t)*(1-cos(a*t))/a^2,t)));
165 /*****************************************************************************
166 Problem 24: A&S: 29.3.20 OK
167 ******************************************************************************/
169 factor(ratsimp(specint(%e^(-s*t)*(a*t-sin(a*t))/a^3,t)));
172 /*****************************************************************************
173 Problem 25: A&S: 29.3.21 OK
174 ******************************************************************************/
176 factor(ratsimp(specint(%e^(-s*t)*(sin(a*t)-a*t*cos(a*t))/(2*a^3),t)));
179 /*****************************************************************************
180 Problem 26: A&S: 29.3.22 OK
181 ******************************************************************************/
183 factor(ratsimp(specint(%e^(-s*t)*t*sin(a*t)/(2*a),t)));
186 /*****************************************************************************
187 Problem 27: A&S: 29.3.23 OK
188 ******************************************************************************/
190 factor(ratsimp(specint(%e^(-s*t)*(sin(a*t)+a*t*cos(a*t))/(2*a),t)));
193 /*****************************************************************************
194 Problem 28: A&S: 29.3.24 OK
195 ******************************************************************************/
197 factor(ratsimp(specint(%e^(-s*t)*t*cos(a*t),t)));
198 (s-a)*(s+a)/(s^2+a^2)^2;
200 /*****************************************************************************
201 Problem 29: A&S: 29.3.25 OK New
202 After implementing a more general code to extract a constant denominator
203 we get the correct result.
204 ******************************************************************************/
206 factor(ratsimp(specint(%e^(-s*t)*(cos(a*t)-cos(b*t))/(b^2-a^2),t)));
207 s/((s^2+a^2)*(s^2+b^2));
209 /*****************************************************************************
210 Problem 30: A&S: 29.3.26 OK
211 ******************************************************************************/
213 factor(ratsimp(specint(%e^(-s*t)*(%e^(-a*t)*sin(b*t))/b,t)));
214 1/(s^2+2*a*s+b^2+a^2);
216 /*****************************************************************************
217 Problem 31: A&S: 29.3.27 OK
218 ******************************************************************************/
220 factor(ratsimp(specint(%e^(-s*t)*(%e^(-a*t)*cos(b*t)),t)));
221 (s+a)/(s^2+2*a*s+b^2+a^2);
223 /*****************************************************************************
224 Problem 32: A&S: 29.3.28 OK
225 ******************************************************************************/
228 factor(ratsimp(specint(%e^(-s*t)*(%e^(-a*t)-%e^(a*t/2)*(cos(a*t*sqrt(3)/2)
229 -sqrt(3)*sin(a*t*sqrt(3)/2))),t))));
230 3*a^2/((s+a)*(s^2-a*s+a^2)); /* that's 3*a^2/(s^3+a^3) */
232 /*****************************************************************************
233 Problem 33: A&S: 29.3.29 OK
234 ******************************************************************************/
236 factor(ratsimp(specint(%e^(-s*t)*(sin(a*t)*cosh(a*t)-cos(a*t)*sinh(a*t)),t)));
237 4*a^3/((s^2-2*a*s+2*a^2)*(s^2+2*a*s+2*a^2));
239 /*****************************************************************************
240 Problem 34: A&S: 29.3.30 OK
241 ******************************************************************************/
243 factor(ratsimp(specint(%e^(-s*t)*sin(a*t)*sinh(a*t)/(2*a^2),t)));
244 s/((s^2-2*a*s+2*a^2)*(s^2+2*a*s+2*a^2));
246 /*****************************************************************************
247 Problem 35: A&S: 29.3.31 OK
248 ******************************************************************************/
250 factor(ratsimp(specint(%e^(-s*t)*(sinh(a*t)-sin(a*t))/(2*a^3),t)));
251 1/((s-a)*(s+a)*(s^2+a^2));
253 /*****************************************************************************
254 Problem 36: A&S: 29.3.32 OK
255 ******************************************************************************/
257 factor(ratsimp(specint(%e^(-s*t)*(cosh(a*t)-cos(a*t))/(2*a^2),t)));
258 s/((s-a)*(s+a)*(s^2+a^2));
260 /*****************************************************************************
261 Problem 37: A&S: 29.3.33 OK
262 ******************************************************************************/
264 factor(ratsimp(specint(%e^(-s*t)*((1+a^2*t^2)*sin(a*t)-a*t*cos(a*t)),t)));
265 8*a^3*s^2/(s^2+a^2)^3;
267 /******************************************************************************
268 Problem 38: A&S: 29.3.34
272 ******************************************************************************/
274 /* We test the integration of the Laguerre function for three different
275 values for the order of the polynom.
278 factor(specint(%e^(-s*t)*laguerre(1,t),t));
281 factor(specint(%e^(-s*t)*laguerre(2,t),t));
284 factor(specint(%e^(-s*t)*laguerre(10,t),t));
287 /*****************************************************************************
288 The code knows the general Laguerre function %l[n,a](x).
289 There should be the relationship: laguerre(n,t) -> %l[n,0](t).
291 But it doesn't work. We got a lot of errors when we try to use %l[n,a](t)
292 in a Laplace transformation.
294 First: The function ltw seems not to be correct. There are differences
295 beetween the code and the formula A&S 13.6.9.
296 The code uses the Lisp-Function FACTORIAL. That's wrong for a
297 symbol. We get a Lisp error. We have to use a general GAMMA
299 Second: In the transformation to a Hypergeomtric function there are
300 similar problems. We get the expression gamma(1-n) which is not
301 defined for all positive integers n. The code stops with the
302 message gamma( .. ) is undefined.
303 The complete transformation formula has to be verified.
304 Last: After some corrections to the routine ltw the result is OK.
307 /* Problem 41: OK New
308 * After correction of some bugs we get the correct result.
309 * First a test with a special value for the order of the Laguerre function.
312 factor(specint(%e^(-s*t)*'laguerre(10,t),t));
315 factor(specint(%e^(-s*t)*'laguerre(n,t),t));
318 /* Problem 43: OK We get a result. New
319 Because n is declared to be an integer, the implemented Laguerre function
320 simplifies to a sum. The summand can be integrated.
321 This summand is equivalent to the general solution above.
324 (assume(i1>0), niceindices(specint(%e^(-s*t)*laguerre(n,t),t)));
325 'sum(gamma(i+1)*pochhammer(-n,i)*s^(-i-1)/i!^2,i,0,n);
327 /*****************************************************************************
328 Problem 44: A&S: 29.3.35 OK
329 ******************************************************************************/
331 factor(specint(%e^(-s*t)*(1/(sqrt(%pi*t))*%e^(-a*t)*(1-2*a*t)),t));
334 /*****************************************************************************
335 Problem 45: A&S: 29.3.36 OK New
337 ******************************************************************************/
339 specint(%e^(-s*t)*(1/(2*sqrt(%pi*t^3)))*(%e^(-b*t)-%e^(-a*t)),t);
340 -sqrt(s+b)+sqrt(s+a);
342 /******************************************************************************
344 * Error functions erf und erfc
346 ******************************************************************************/
351 /*****************************************************************************
352 Problem 47: A&S: 29.3.37 OK
353 ******************************************************************************/
355 factor(ratsimp(specint(%e^(-s*t)*(1/sqrt(%pi*t)-a*%e^(a^2*t)
356 *erfc(a*sqrt(t))),t)));
359 /*****************************************************************************
360 Problem 48: A&S: 29.3.38 OK
361 ******************************************************************************/
363 factor(ratsimp(specint(%e^(-s*t)*(1/sqrt(%pi*t)+a*%e^(a^2*t)
364 *erf(a*sqrt(t))),t)));
367 /*****************************************************************************
368 Problem 49: A&S: 29.3.39 OK
369 In this Laplace transform the integral represents the erfi function.
370 Maxima does the integration correct.
371 ******************************************************************************/
374 factor(ratsimp(specint(%e^(-s*t)*(1/sqrt(%pi*t)-2*a/sqrt(%pi)*%e^(-a^2*t)
375 *integrate(%e^(lambda^2),lambda,0,a*sqrt(t))),t))));
378 /*****************************************************************************
379 Problem 50: A&S: 29.3.40 OK
380 ******************************************************************************/
382 factor(ratsimp(specint(%e^(-s*t)*1/a*%e^(a^2*t)*erf(a*sqrt(t)),t)));
385 /*****************************************************************************
386 Problem 51: A&S: 29.3.41 OK
387 ******************************************************************************/
389 factor(ratsimp(specint(%e^(-s*t)*(2/(a*sqrt(%pi))*%e^(-a^2*t)
390 *integrate(%e^(lambda^2),lambda,0,a*sqrt(t))),t)));
393 /*****************************************************************************
394 Problem 52: A&S: 29.3.42 OK
395 ******************************************************************************/
397 (assume(s-b^2>0,b>0),
398 factor(ratsimp(specint(%e^(-s*t)*(%e^(a^2*t)*(b-a*erf(a*sqrt(t)))
399 -b*%e^(b^2*t)*erfc(b*sqrt(t))),t))));
400 (b-a)*(b+a)*(sqrt(s)-b)/((s-a^2)*(s-b^2));
402 /*****************************************************************************
403 Problem 53: A&S: 29.3.43 OK
404 ******************************************************************************/
406 factor(ratsimp(specint(%e^(-s*t)*%e^(a^2*t)*erfc(a*sqrt(t)),t)));
407 (sqrt(s)-a)/(sqrt(s)*(s-a^2));
409 /*****************************************************************************
410 Problem 54: A&S: 29.3.44 OK
411 ******************************************************************************/
413 factor(ratsimp(specint(%e^(-s*t)*(1/sqrt(b-a))*%e^(-a*t)
414 *erf(sqrt(b-a)*sqrt(t)),t)));
417 /*****************************************************************************
418 Problem 55: A&S: 29.3.45 OK
419 ******************************************************************************/
421 factor(ratsimp(specint(%e^(-s*t)*(%e^(a^2*t)*(b/a*erf(a*sqrt(t))-1)
422 +%e^(b^2*t)*erfc(b*sqrt(t))),t)));
423 ((b-a)*(b+a)*(s-b*sqrt(s)))/(s*(s-a^2)*(s-b^2));
425 /******************************************************************************
426 Problem 56: A&S 29.3.46 and A&S 29.3.47
429 ******************************************************************************/
431 /* We test the integration of the Hermite Polynom for three different
432 values for the order of the polynom.
435 block (h1(n,x):= n!/((2*n)!*sqrt(%pi*t))*hermite(2*n,sqrt(t)),
436 h1(n,x):= n!/((2*n)!*sqrt(%pi*t))*hermite(2*n,sqrt(t)),
443 factor(specint(%e^(-s*t)*h1(1,t),t));
448 factor(specint(%e^(-s*t)*h1(2,t),t));
453 factor(specint(%e^(-s*t)*h1(10,t),t));
454 ((s-1)^10/(s^(10+1/2)));
458 h2(n,x):= n!/((2*n+1)!*sqrt(%pi))*hermite(2*n+1,sqrt(t));
459 h2(n,x):= n!/((2*n+1)!*sqrt(%pi))*hermite(2*n+1,sqrt(t));
463 factor(specint(%e^(-s*t)*h2(1,t),t));
468 factor(specint(%e^(-s*t)*h2(2,t),t));
473 factor(specint(%e^(-s*t)*h2(10,t),t));
474 ((s-1)^10/(s^(10+3/2)));
476 /* Laplace transform of hermite for even and odd order:
478 * Problem 64: AS 29.3.46
481 laplace(1/sqrt(t)*'hermite(2*n,sqrt(t)),t,s);
482 %pi*2^(2*n)*(1-1/s)^n/(gamma((2*n-1)/-2)*sqrt(s));
484 /* Problem 65: AS 29.3.47 */
486 laplace('hermite(2*n+1,sqrt(t)),t,s);
487 -%pi*2^(2*n+2)*(1-1/s)^n/(2*gamma((2*n+1)/-2)*s^(3/2));
489 /******************************************************************************
490 A&S 29.3.48 to A&S 29.3.60
492 Bessel I und Bessel J
493 ******************************************************************************/
495 /*****************************************************************************
496 Problem 66: A&S: 29.3.48 OK
497 ******************************************************************************/
499 factor(specint(%e^(-s*t)*a*%e^(-a*t)*(bessel_i(1,a*t)+bessel_i(0,a*t)),t));
500 -1*((sqrt(s)*sqrt(s+2*a)-s-2*a)/(sqrt(s)*sqrt(s+2*a)));
502 /*****************************************************************************
503 Problem 67: A&S: 29.3.49 OK
504 ******************************************************************************/
506 factor(specint(%e^(-s*t)*%e^(-(a+b)/2*t)*bessel_i(0,(a-b)/2*t),t));
507 1/sqrt(s^2+(b+a)*s+a*b);
509 /*****************************************************************************
510 Problem 68: A&S: 29.3.50 OK New
511 Maxima doesn't know the simplification for gamma(2*k), but the
513 The original code gives additional phase factors.
514 ******************************************************************************/
517 factor(radcan(specint(%e^(-s*t)*sqrt(%pi)*(t/(a-b))^(k-1/2)
518 *%e^(-(a+b)/2*t)*bessel_i(k-1/2,(a-b)/2*t),t))));
519 2*sqrt(%pi)*gamma(2*k)/(2^(2*k)*gamma((2*k+1)/2)*(s+a)^k*(s+b)^k);
521 /*****************************************************************************
522 Problem 69: A&S: 29.3.51 OK
523 ******************************************************************************/
525 factor(specint(%e^(-s*t)*t*%e^(-(a+b)/2*t)*(bessel_i(0,(a-b)/2*t)
526 +bessel_i(1,(a-b)/2*t)),t));
527 1/((s+b)*sqrt(s^2+(b+a)*s+a*b));
529 /*****************************************************************************
530 Problem 70: A&S: 29.3.52 OK
531 ******************************************************************************/
533 factor(specint(%e^(-s*t)*(1/t)*%e^(-a*t)*bessel_i(1,a*t),t));
534 /*(sqrt(s+2*a)-sqrt(s))/(sqrt(s+2*a)+sqrt(s));*/
535 -((sqrt(s)*sqrt(s+2*a)-s-a)/a);
537 /*****************************************************************************
538 Problem 71: A&S: 29.3.53 OK New
539 The additional phase factor vanish.
540 ******************************************************************************/
542 /* The result isn't as simple as A&S but correct */
544 factor(radcan(specint(%e^(-s*t)*(k/t)*%e^(-(a+b)/2*t)*bessel_i(k,(a-b)/2*t),t)));
545 /* (a-b)^k/(sqrt(s+a)+sqrt(s+b))^(2*k); */
546 ((b-a)^k*k*(-1)^k*gamma(k))/(gamma(k+1)*(2*sqrt(s+a)*sqrt(s+b)+2*s+b+a)^k);
548 /*****************************************************************************
549 Problem 72: A&S: 29.3.54 OK New
550 The additional phase factor vanish.
551 ******************************************************************************/
554 factor(specint(%e^(-s*t)*(1/a^nu)*%e^(-a/2*t)*bessel_i(nu,a/2*t),t)));
555 /*((sqrt(s+a)+sqrt(s))^(-2*nu))/(sqrt(s)*sqrt(s+a));*/
556 1/(sqrt(s)*sqrt(s+a)*(2*sqrt(s)*sqrt(s+a)+2*s+a)^nu);
558 /*****************************************************************************
559 Problem 73: A&S: 29.3.55 OK
560 ******************************************************************************/
562 factor(specint(%e^(-s*t)*bessel_j(0,a*t),t));
565 /*****************************************************************************
566 Problem 74: A&S: 29.3.56 OK
567 ******************************************************************************/
569 factor(specint(%e^(-s*t)*a^nu*bessel_j(nu,a*t),t));
570 a^(2*nu)/(sqrt(s^2+a^2)*(sqrt(s^2+a^2)+s)^nu);
572 /*****************************************************************************
573 Problem 75: A&S: 29.3.57 OK
574 Maxima doesn't know the simplification for gamma(2*k)
575 ******************************************************************************/
577 factor(specint(%e^(-s*t)*sqrt(%pi)/gamma(k)*(t/(2*a))^(k-1/2)*bessel_j(k-1/2,a*t),t));
578 2*sqrt(%pi)*gamma(2*k)/(2^(2*k)*gamma(k)*gamma((2*k+1)/2)*(s^2+a^2)^k);
580 /*****************************************************************************
581 Problem 76: A&S: 29.3.58 OK
582 The result of Maxima is correct and can be further simplified to
584 ******************************************************************************/
586 factor(specint(%e^(-s*t)*(k*a^k/t)*bessel_j(k,a*t),t));
587 a^(2*k)*k*gamma(k)/(gamma(k+1)*(sqrt(s^2+a^2)+s)^k);
589 /*****************************************************************************
590 Problem 77: A&S: 29.3.59 OK New
591 The additional phase factors vanish.
592 The result can be further simplified to (s-sqrt(s^2-a^2))^nu/sqrt(s^2-a^2)
593 ******************************************************************************/
595 factor(specint(%e^(-s*t)*a^nu*bessel_i(nu,a*t),t));
596 a^(2*nu)/(sqrt(s^2-a^2)*(sqrt(s^2-a^2)+s)^nu);
598 /*****************************************************************************
599 Problem 78: A&S: 29.3.60 OK New
600 Use gamma(2*z)=2^(2*z-1)/sqrt(%pi)*gamma(z)*gamma(z+1/2) to show that
601 the result of Maxima is equivalent to the result of A&S: 1/(s^2-a^2)^k;
602 The additional phase factors vanish.
603 ******************************************************************************/
605 radcan(specint(%e^(-s*t)*sqrt(%pi)/gamma(k)*(t/(2*a))^(k-1/2)
606 *bessel_i(k-1/2,a*t),t));
607 2*sqrt(%pi)*gamma(2*k)/(2^(2*k)*gamma(k)*gamma((2*k+1)/2)*(s-a)^k*(s+a)^k);
609 /*****************************************************************************
610 Problem 79: A&S: 29.3.61 OK New
611 An algorithm for the Unit Step function has been implemented.
612 ******************************************************************************/
614 specint(%e^(-s*t)*unit_step(t-k),t);
617 /*****************************************************************************
618 Problem 80: A&S: 29.3.62 OK New
619 ******************************************************************************/
621 radcan(specint(%e^(-s*t)*(t-k)*unit_step(t-k),t));
624 /*****************************************************************************
625 Problem 81: A&S: 29.3.63 OK New
626 ******************************************************************************/
628 ratsimp(specint(%e^(-s*t)*(t-k)^(nu-1)/gamma(nu)*unit_step(t-k),t));
631 /*****************************************************************************
632 Problem 82: A&S: 29.3.64 OK New
633 ******************************************************************************/
635 ratsimp(specint(%e^(-s*t)*(unit_step(t)-unit_step(t-k)),t));
636 (%e^(-s*k)*(%e^(k*s)-1))/s;
638 /*****************************************************************************
639 Problem 83: A&S: 29.3.65 OK New
640 ******************************************************************************/
642 ratsimp(specint(%e^(-s*t)*sum(unit_step(t-n*k),n,0,inf),t)),simpsum;
643 %e^(k*s)/(s*%e^(k*s)-s);
645 /*****************************************************************************
646 Problem 84: A&S: 29.3.66 (OK NEW)
647 $SPECINT gets a result with a sum. This sum simplifies with simpsum to
648 the correct result: 1/(s*%e^(k*s)-a*s)
650 But Maxima ask in the simplifier of the sum for the sign of %e^(k*?psey)-a.
651 We have a problem to give Maxima this as a rule. It doesn't work.
652 But when we do it in two steps and give a rule for %e^(k*s)-a it works and
653 we get the expected result.
654 ******************************************************************************/
657 (assume(%e^(k*s)-a>0),
658 result:ratsimp(specint(%e^(-s*t)*sum(a^(n-1)*unit_step(t-n*k),n,1,inf),t)),
659 ev(result,simpsum)));
660 %e^(-k*s)/(s*(1-a*%e^(-k*s)));
662 /*****************************************************************************
663 Problem 85: A&S: 29.3.67 OK New
664 The result of Maxima is equivalent to 1/s*tanh(k*s)
665 ******************************************************************************/
667 factor(ratsimp(specint(%e^(-s*t)*(unit_step(t)+2*sum((-1)^n*unit_step(t-2*n*k),n,1,inf)),t))),simpsum;
668 (%e^(k*s)-1)*(%e^(k*s)+1)/(s*(%e^(2*k*s)+1));
670 /*****************************************************************************
671 Problem 86: A&S: 29.3.68 OK New
672 ******************************************************************************/
674 ratsimp(specint(%e^(-s*t)*sum((-1)^n*unit_step(t-n*k),n,0,inf),t)),simpsum;
675 %e^(k*s)/(s*%e^(k*s)+s);
677 /*****************************************************************************
678 Problem 87: A&S: 29.3.69 OK New
679 ******************************************************************************/
681 factor(ratsimp(specint(%e^(-s*t)*(t*unit_step(t)+2*sum((-1)^n*(t-2*n*k)
682 *unit_step(t-2*n*k),n,1,inf)),t))),simpsum;
683 (%e^(k*s)-1)*(%e^(k*s)+1)/(s^2*(%e^(2*k*s)+1));
685 /*****************************************************************************
686 Problem 88: A&S: 29.3.70 OK New
687 ******************************************************************************/
689 factor(ratsimp(specint(%e^(-s*t)
690 *2*sum(unit_step(t-(2*n+1)*k),n,0,inf),t))),simpsum;
691 2*%e^(k*s)/(s*(%e^(k*s)-1)*(%e^(k*s)+1));
693 /*****************************************************************************
694 Problem 89: A&S: 29.3.71 OK New
695 ******************************************************************************/
697 factor(ratsimp(specint(%e^(-s*t)*2*sum((-1)^n
698 *unit_step(t-(2*n+1)*k),n,0,inf),t))),simpsum;
699 2*%e^(k*s)/(s*(%e^(2*k*s)+1));
701 /*****************************************************************************
702 Problem 90: A&S: 29.3.72 OK New
703 ******************************************************************************/
705 factor(ratsimp(specint(%e^(-s*t)*(unit_step(t)
706 +2*sum(unit_step(t-2*n*k),n,1,inf)),t))),simpsum;
707 (%e^(2*k*s)+1)/(s*(%e^(k*s)-1)*(%e^(k*s)+1));
709 /*****************************************************************************
710 Problem 91: A&S: 29.3.73 (OK Noun form New)
711 We have no algorithm for the Abs function.
712 The result is k/(s^2+k^2)*coth(%pi*s/(2*k))
713 Because we exponentialize the integrand, we don't get
714 a noun form with the original Sin function.
715 ******************************************************************************/
717 specint(%e^(-s*t)*abs(sin(k*t)),t);
718 'specint(%e^-(s*t)*abs(%e^(2*%i*k*t)-1),t)/2$
720 /*****************************************************************************
721 Problem 92: A&S: 29.3.74 OK New
722 ******************************************************************************/
724 factor(ratsimp(specint(%e^(-s*t)*sum((-1)^n*sin(t)
725 *unit_step(t-n*%pi),n,0,inf),t))),simpsum;
726 %e^(%pi*s)/((s^2+1)*(%e^(%pi*s)-1));
728 /*****************************************************************************
729 Problem 93: A&S: 29.3.75 OK
730 ******************************************************************************/
732 factor(specint(%e^(-s*t)*bessel_j(0,2*sqrt(k*t)),t));
735 /*****************************************************************************
736 Problem 94: A&S: 29.3.76 OK New
737 ******************************************************************************/
739 ratsimp(specint(%e^(-s*t)*1/sqrt(%pi*t)*cos(2*sqrt(k*t)),t));
742 /*****************************************************************************
743 Problem 95: A&S: 29.3.77 OK New
744 ******************************************************************************/
746 ratsimp(specint(%e^(-s*t)*1/sqrt(%pi*t)*cosh(2*sqrt(k*t)),t));
749 /*****************************************************************************
750 Problem 96: A&S: 29.3.78 OK New
751 ******************************************************************************/
753 ratsimp(specint(%e^(-s*t)*1/sqrt(%pi*k)*sin(2*sqrt(k*t)),t));
756 /*****************************************************************************
757 Problem 97: A&S: 29.3.79 OK New
758 ******************************************************************************/
760 ratsimp(specint(%e^(-s*t)*1/sqrt(%pi*k)*sinh(2*sqrt(k*t)),t));
763 /*****************************************************************************
764 Problem 98: A&S: 29.3.80 OK
765 ******************************************************************************/
768 ratsimp(specint(%e^(-s*t)*(t/k)^((nu-1)/2)*bessel_j(nu-1,2*sqrt(k*t)),t)));
771 /*****************************************************************************
772 Problem 99: A&S: 29.3.81 OK New
773 ******************************************************************************/
776 ratsimp(specint(%e^(-s*t)*(t/k)^((nu-1)/2)*bessel_i(nu-1,2*sqrt(k*t)),t)));
779 /******************************************************************************
780 Problem 100: A&S: 29.3.82 OK New
781 ******************************************************************************/
783 (block [besselexpand:true],
784 ratsimp(exponentialize(
785 specint(%e^(-s*t)*k/(2*sqrt(%pi*t^3))*%e^(-k^2/(4*t)),t))));
788 /******************************************************************************
789 Problem 101: A&S: 29.3.83 (OK noun form New)
790 Maxima doesn't find a result. The noun form is correct.
791 Tabulated result is: 1/s*%e^(-k*sqrt(s))
792 ******************************************************************************/
794 specint(%e^(-s*t)*erfc(k/(2*sqrt(t))),t);
795 'specint(%e^(-s*t)*erfc(k/(2*sqrt(t))),t);
797 /*****************************************************************************
798 Problem 102: A&S: 29.3.84 OK New
799 ******************************************************************************/
801 ratsimp(exponentialize(specint(%e^(-s*t)/sqrt(%pi*t)*%e^(-k^2/(4*t)),t)));
802 1/sqrt(s)*%e^(-k*sqrt(s));
804 /*****************************************************************************
805 Problem 103: A&S: 29.3.85 (OK noun form New)
806 Tabulated result: 1/s^2*%e^(-k*sqrt(s))
807 ******************************************************************************/
809 specint(%e^(-s*t)*2*sqrt(t)*%i*erfc(k/(2*sqrt(t))),t);
810 'specint(%e^(-s*t)*2*sqrt(t)*%i*erfc(k/(2*sqrt(t))),t);
812 /*****************************************************************************
813 Problem 104: A&S: 29.3.86 (OK noun form New)
814 Tabulated result: 1/(1+n/2)*%e^(-k*sqrt(s))
815 ******************************************************************************/
817 specint(%e^(-s*t)*(4*t)^(n/2)*%i*erfc(k/(2*sqrt(t))),t);
818 'specint(%e^(-s*t)*(4*t)^(n/2)*%i*erfc(k/(2*sqrt(t))),t);
820 /*****************************************************************************
821 Problem 105: A&S: 29.3.87 (OK noun form New)
822 We have no algorithm for an argument 1/sqrt(t).
823 Tabulated result: s^((n-1)/2)*%e^(-k*sqrt(s));
824 ******************************************************************************/
826 specint(%e^(-s*t)*%e^(-k^2/(4*t))/(2^n*sqrt(%pi*t^(n+1)))
827 *hermite(n,(k/(2*sqrt(t)))),t);
828 'specint(hermite(n,k/(2*sqrt(t)))*t^(-n/2-1/2)*%e^(-s*t-k^2/(4*t)),t)
831 /*****************************************************************************
832 Problem 106: A&S: 29.3.88 (Ok noun form New)
833 Tabulated result: %e^(-k*sqrt(s))/(a*sqrt(s));
834 We have a sum with 3 terms. Maxima gives a partially result for 2 terms.
835 ******************************************************************************/
837 factor(ratsimp(specint(%e^(-s*t)*(1/sqrt(%pi*t)*exp(-k^2/(4*t))
838 -a*%e^(a*k)*%e^(a^2*t)*erfc(a*sqrt(t)+k/(2*sqrt(t)))),t)));
839 (sqrt(s)*'specint(-a*%e^(-s*t+a^2*t+a*k)*erfc((2*a*t+k)/(2*sqrt(t))),t)
840 -sinh(k*sqrt(s))+cosh(k*sqrt(s)))/sqrt(s);
842 /*****************************************************************************
843 Problem 107: A&S: 29.3.89 (OK noun form New)
844 Tabulated result: a*e^(-k*sqrt(s))/(s*(a+sqrt(s)));
845 ******************************************************************************/
847 specint(%e^(-s*t)*(-%e^(a*k)*%e^(a^2*t)*erfc(a*sqrt(t)+k/(2*sqrt(t)))
848 +erfc(k/(2*sqrt(t)))),t);
849 'specint(-erfc(a*sqrt(t)+k/(2*sqrt(t)))*%e^(-s*t+a^2*t+a*k),t)
850 +'specint(erfc(k/(2*sqrt(t)))*%e^-(s*t),t);
852 /*****************************************************************************
853 Problem 108: A&S: 29.3.90 (OK noun form New)
854 Tabulated result: %e^(-k*sqrt(s))/(sqrt(s)*(a+sqrt(s)));
855 ******************************************************************************/
857 specint(%e^(-s*t)*%e^(a*k)*%e^(a^2*t)*erfc(a*sqrt(t)+k/(2*sqrt(t))),t);
858 'specint(%e^(-s*t)*%e^(a*k)*%e^(a^2*t)*erfc(a*sqrt(t)+k/(2*sqrt(t))),t);
860 /*****************************************************************************
861 Problem 109: A&S: 29.3.91 (Ok noun form New)
862 Tabulated result: %e^(-k*sqrt(s*(s+a)))/sqrt(s*(s+a))
863 ******************************************************************************/
865 specint(%e^(-s*t)*%e^(a*t/2)*bessel_i(0,1/2*a*sqrt(t^2-k^2))*unit_step(t-k),t);
866 'specint(%e^(-s*t)*%e^(a*t/2)*bessel_i(0,1/2*a*sqrt(t^2-k^2))*unit_step(t-k),t);
868 /*****************************************************************************
869 Problem 110: A&S: 29.3.92 (OK noun form New)
870 Tabulated result: %e^(-k*sqrt(s^2+a^2))/sqrt(s^2+a^2)
871 ******************************************************************************/
873 specint(%e^(-s*t)*bessel_j(0,a*sqrt(t^2-k^2))*unit_step(t-k),t);
874 'specint(%e^(-s*t)*bessel_j(0,a*sqrt(t^2-k^2))*unit_step(t-k),t);
876 /*****************************************************************************
877 Problem 111: A&S: 29.3.93 (OK noun form New)
878 Tabulated result: %e^(-k*sqrt(s^2-a^2))/sqrt(s^2-a^2)
879 ******************************************************************************/
881 specint(%e^(-s*t)*bessel_i(0,a*sqrt(t^2-k^2))*unit_step(t-k),t);
882 'specint(%e^(-s*t)*bessel_i(0,a*sqrt(t^2-k^2))*unit_step(t-k),t);
884 /*****************************************************************************
885 Problem 112: A&S: 29.3.94 (OK noun form New)
886 Tabulated result: %e^(-k*(sqrt(s^2+a^2))-s)/sqrt(s^2+a^2)
887 ******************************************************************************/
889 specint(%e^(-s*t)*bessel_j(0,a*sqrt(t^2+2*k*t)),t);
890 'specint(%e^(-s*t)*bessel_j(0,a*sqrt(t)*sqrt(t+2*k)),t);
892 /*****************************************************************************
893 Problem 113: A&S: 29.3.95 (OK noun form New)
894 Tabulated result: %e^(-k*s)-%e^(-k*sqrt(s^2+a^2))
895 ******************************************************************************/
897 specint(%e^(-s*t)*a*k/sqrt(t^2-k^2)*bessel_j(1,a*sqrt(t^2-k^2))*unit_step(t-k),t);
898 'specint(%e^(-s*t)*a*k/sqrt(t^2-k^2)*bessel_j(1,a*sqrt(t^2-k^2))*unit_step(t-k),t);
900 /*****************************************************************************
901 Problem 114: A&S: 29.3.96 (OK noun form New)
902 Tabulated result: -%e^(-k*s)+%e^(-k*sqrt(s^2-a^2))
903 ******************************************************************************/
905 specint(%e^(-s*t)*a*k/sqrt(t^2-k^2)*bessel_i(1,a*sqrt(t^2-k^2))*unit_step(t-k),t);
906 'specint(%e^(-s*t)*a*k/sqrt(t^2-k^2)*bessel_i(1,a*sqrt(t^2-k^2))*unit_step(t-k),t);
908 /*****************************************************************************
909 Problem 115: A&S: 29.3.97 (OK noun form New)
911 a^nu*%e^(-k*sqrt(s^2+a^2))/(sqrt(s^2+a^2)*a^2*(sqrt(s^2+a^2)+s)^nu)
912 ******************************************************************************/
914 specint(%e^(-s*t)*((t-k)/(t+k))^(nu/2)*bessel_j(nu,a*sqrt(t^2-k^2))*unit_step(t-k),t);
915 'specint(%e^(-s*t)*((t-k)/(t+k))^(nu/2)*bessel_j(nu,a*sqrt(t^2-k^2))*unit_step(t-k),t);
917 /*****************************************************************************
918 Problem 116: A&S: 29.3.98 OK New
919 ******************************************************************************/
921 ratsimp(specint(%e^(-s*t)*(-%gamma-log(t)),t));
924 /*****************************************************************************
925 Problem 117: A&S: 29.3.99 OK New
926 ******************************************************************************/
928 ratsimp(specint(%e^(-s*t)*t^(k-1)/gamma(k)*(psi[0](k)-log(t)),t));
931 /*****************************************************************************
932 Problem 118: A&S: 29.3.100 OK NEW
933 We support the expintegral_e1 and get a new result.
934 Tabulated result: log(s)/(s-a);
935 ******************************************************************************/
937 ratsimp(specint(%e^(-s*t)*%e^(a*t)*(log(a)+expintegral_e1(a*t)),t));
940 /*****************************************************************************
941 Problem 119: A&S: 29.3.101 OK NEW
943 Tabulated result: log(s)/(s^2+1)
944 ******************************************************************************/
946 radcan(specint(%e^(-s*t)*(cos(t)*expintegral_si(t)-sin(t)*expintegral_ci(t)),t)),
947 logarc:true,logexpand:super;
950 /*****************************************************************************
951 Problem 120: A&S: 29.3.102 OK NEW
952 Tabulated result: s*log(s)/(s^2+1)
953 ******************************************************************************/
955 radcan(specint(%e^(-s*t)*(-sin(t)*expintegral_si(t)-cos(t)*expintegral_ci(t)),t)),
956 logarc:true,logexpand:super;
959 /*****************************************************************************
960 Problem 121: A&S: 29.3.103 OK New
961 We support the expintegral_e1 and get a new result.
962 Tabulated result: 1/s*log(1+k*s)
963 ******************************************************************************/
965 specint(%e^(-s*t)*expintegral_e1(t/k),t);
968 /*****************************************************************************
969 Problem 122: A&S: 29.3.104 OK New
970 ******************************************************************************/
972 specint(%e^(-s*t)*1/t*(%e^(-b*t)-%e^(-a*t)),t);
975 /*****************************************************************************
976 Problem 123: A&S: 29.3.105 OK NEW
977 Tabulated result: 1/s*log(1+k^2*s^2)
978 ******************************************************************************/
980 radcan(specint(%e^(-s*t)*(-2)*expintegral_ci(t/k),t));
983 /*****************************************************************************
984 Problem 124: A&S: 29.3.106 OK NEW
985 Tabulated result: 1/s*log(s^2+a^2)
986 ******************************************************************************/
988 ratsimp(specint(%e^(-s*t)*(2*log(a)-2*expintegral_ci(a*t)),t));
991 /*****************************************************************************
992 Problem 125: A&S: 29.3.107 OK NEW
993 We get a correct noun form with a partially evaluated integral.
994 Tabulated result: 1/s^2*log(s^2+a^2)
995 ******************************************************************************/
997 ratsimp(specint(%e^(-s*t)*(2*t*log(a)+2/a*sin(a*t)-2*t*expintegral_ci(a*t)),t));
1000 /*****************************************************************************
1001 Problem 126: A&S: 29.3.108 OK New
1002 Tabulated result: log((s^2+a^2)/s^2);
1003 ******************************************************************************/
1005 specint(%e^(-s*t)*2/t*(1-cos(a*t)),t);
1008 /*****************************************************************************
1009 Problem 127: A&S: 29.3.109 OK New
1010 Tabulated result: log((s^2-a^2)/s^2);
1011 ******************************************************************************/
1013 specint(%e^(-s*t)*2*(1-cosh(a*t))/t,t);
1016 /*****************************************************************************
1017 Problem 128: A&S: 29.3.110 OK New
1019 ******************************************************************************/
1021 radcan(specint(%e^(-s*t)*sin(k*t)/t,t));
1022 -((%i*log(s+%i*k)-%i*log(s-%i*k)) /2);
1024 /*****************************************************************************
1025 Problem 129: A&S: 29.3.111 (OK Noun form New)
1027 ******************************************************************************/
1029 specint(%e^(-s*t)*expintegral_si(k*t),t);
1032 /*****************************************************************************
1033 Problem 130: A&S: 29.3.112 OK
1034 ******************************************************************************/
1036 factor(ratsimp(specint(%e^(-s*t)*1/(k*sqrt(%pi))*exp(-t^2/(4*k^2)),t)));
1037 -%e^(k^2*s^2)*(erf(k*s)-1);
1039 /*****************************************************************************
1040 Problem 131: A&S: 29.3.113 (Ok noun form New)
1041 Tabulated result: 1/s*%e^(k^2*s^2)*erfc(k*s);
1042 ******************************************************************************/
1044 specint(%e^(-s*t)*erf(t/(2*k)),t);
1045 'specint(%e^(-s*t)*erf(t/(2*k)),t);
1047 /*****************************************************************************
1048 Problem 132: A&S: 29.3.114 OK New
1049 Tabulated result is %e^(k*s)*erfc(sqrt(k*s));
1050 ******************************************************************************/
1052 radcan(specint(%e^(-s*t)*sqrt(k)/(%pi*sqrt(t)*(t+k)),t));
1053 %e^(k*s)*(1-erf(sqrt(k*s)));
1055 /*****************************************************************************
1056 Problem 133: A&S: 29.3.115 OK New
1057 gamma_incomplete(1/2,a*s)=sqrt(%pi)*erfc(sqrt(a*s))
1058 1/sqrt(s)*erfc(sqrt(k*s));
1059 ******************************************************************************/
1061 specint(%e^(-s*t)/sqrt(%pi*t)*unit_step(t-k),t),gamma_expand:true;
1062 1/sqrt(s)*erfc(sqrt(k)*sqrt(s));
1064 /*****************************************************************************
1065 Problem 134: A&S: 29.3.116 OK New
1066 1/sqrt(s)*%e^(k*s)*erfc(sqrt(k*s));
1067 ******************************************************************************/
1069 specint(%e^(-s*t)*1/sqrt(%pi*(t+k)),t),gamma_expand:true;
1070 erfc(sqrt(k)*sqrt(s))*%e^(k*s)/sqrt(s);
1072 /*****************************************************************************
1073 Problem 135: A&S: 29.3.117 (OK noun form)
1074 We have t^-1*sin(sqrt(t)) and F35P147 fails because of factor t^-1.
1075 Tabulated result: erf(k/sqrt(s));
1076 ******************************************************************************/
1078 radcan(specint(%e^(-s*t)*sin(2*k*sqrt(t))/(%pi*t),t));
1079 'specint(-%i*%e^(2*%i*k*sqrt(t)-s*t)/(2*%pi*t),t)
1080 +'specint(%i*%e^(-s*t-2*%i*k*sqrt(t))/(2*%pi*t),t);
1082 /*****************************************************************************
1083 Problem 136: A&S: 29.3.118 OK
1084 ******************************************************************************/
1086 ratsimp(specint(%e^(-s*t)*1/sqrt(%pi*t)*%e^(-2*k*sqrt(t)),t));
1087 -((erf(k/sqrt(s))-1)*%e^(k^2/s)/sqrt(s));
1089 /*****************************************************************************
1090 Problem 137: A&S: 29.3.119 (OK noun form New)
1092 We have no algorithm for 1/sqrt(t^2-k^2)
1093 ******************************************************************************/
1095 specint(%e^(-s*t)*1/sqrt(t^2-k^2)*unit_step(t-k),t);
1096 'specint(%e^(-s*t)*1/sqrt(t^2-k^2)*unit_step(t-k),t);
1098 /*****************************************************************************
1099 Problem 138: A&S: 29.3.120 OK New
1100 ******************************************************************************/
1102 specint(%e^(-s*t)*1/(2*t)*exp(-k^2/(4*t)),t);
1103 bessel_k(0,k*sqrt(s));
1105 /*****************************************************************************
1106 Problem 139: A&S: 29.3.121 OK New
1107 We know U(3/2,3,z)= %e^(k*s)*bessel_k(1,z/2)/(sqrt(%pi)*z) and we get
1108 the tabulated result: 1/s*%e^(k*s)*bessel_k(1,k*s);
1109 ******************************************************************************/
1111 ratsimp(specint(%e^(-s*t)/k*sqrt(t*(t+2*k)),t));
1112 2*k*sqrt(%pi)*hypergeometric_u(3/2,3,(2*k*s));
1114 /*****************************************************************************
1115 Problem 140: A&S: 29.3.122 OK New
1116 The original code had an extra factor.
1117 ******************************************************************************/
1119 specint(%e^(-s*t)/k*%e^(-k^2/(4*t)),t);
1120 1/sqrt(s)*bessel_k(1,k*sqrt(s));
1122 /*****************************************************************************
1123 Problem 141: A&S: 29.3.123 (OK noun formn New)
1124 1/sqrt(s)*%e^(k/s)*bessel_k(0,k/s);
1125 ******************************************************************************/
1127 specint(%e^(-s*t)*2/sqrt(%pi*t)*bessel_k(0,2*sqrt(2*k*t)),t);
1128 'specint(2*bessel_k(0,2*sqrt(2)*sqrt(k)*sqrt(t))*%e^(-s*t)/(sqrt(%pi)*sqrt(t)),t);
1130 /*****************************************************************************
1131 Problem 142: A&S: 29.3.124 OK New
1132 We get a result in parts. I think the algorithm to calculate t^v*(t+a)^w
1133 can be further generalized to get also a result for this integral.
1134 The problem is the pattern which doesn't match sqrt(2*k-t).
1135 The pattern is further generalizied. With
1136 U(1/2,1,z)=%e^(z/2)*K0(z/2)
1137 U(1/2,1-z)=%e^(-z/2)*(K0(z/2)+%i*%pi*I0(z/2))
1138 we get the expected result:
1139 %pi*%e^(-s*k)*bessel_i(0,k*s);
1140 ******************************************************************************/
1142 specint(%e^(-s*t)*(unit_step(t)-unit_step(t-2*k))/sqrt(t*(2*k-t)),t);
1143 sqrt(%pi)*%i*'hypergeometric_u(1/2,1,2*k*s)*%e^-(2*k*s)-sqrt(%pi)*%i*'hypergeometric_u(1/2,1,-2*k*s);
1145 /*****************************************************************************
1146 Problem 143: A&S: 29.3.125 Error
1147 Can we verrify the result: %e^(-s*k)*bessel_i(1,k*s)
1148 Here we have a problem: We get a result with four Hypergeometric U functions.
1149 But the result simplifies to something like
1150 (a * bessel_i(0,k*s) + b * bessel_i(1,k*s))*%e^(-s*k)
1151 We have no bessel_i(0,k*s) in the expected result. What is wrong???
1152 We declare this test to be an error.
1153 ******************************************************************************/
1155 radcan(specint(%e^(-s*t)*(unit_step(t)-unit_step(t-2*k))*(k-t)/(%pi*k*sqrt(t*(2*k-t))),t));
1158 /*****************************************************************************
1159 Problem 144: A&S: 29.3.126 OK
1161 ******************************************************************************/
1163 specint(%e^(-s*t)/(t+a),t);
1164 gamma_incomplete(0,a*s)*%e^(a*s);
1166 /*****************************************************************************
1167 Problem 145: A&S: 29.3.127 OK
1168 (1/a-s*%e^(a*s)*E[1](a*s));
1169 ******************************************************************************/
1171 radcan(specint(%e^(-s*t)/(t+a)^2,t)),gamma_expand:true;
1172 (expintegral_ei(-a*s)*a*s*%e^(a*s)+1)/a;
1174 /*****************************************************************************
1175 Problem 146: A&S: 29.3.128 OK
1176 (a^(1-n)*%e^(a*s)*E[n](a*s));
1177 ******************************************************************************/
1179 specint(%e^(-s*t)/(t+a)^n,t);
1180 gamma_incomplete(1-n,a*s)*s^(n-1)*%e^(a*s);
1182 /*****************************************************************************
1183 Problem 147: A&S: 29.3.129 (OK noun form)
1184 (%pi/2-Si(s))*cos(s)+Ci(s)*sin(s);
1185 For this case the noun form doesn't look nice.
1186 ******************************************************************************/
1188 specint(%e^(-s*t)/(t^2+1),t);
1189 'specint(1/(t^2*%e^(s*t)+%e^(s*t)),t);
1191 /*****************************************************************************
1192 End of tests from A&S
1193 ******************************************************************************/
1194 /*******************************************************************************
1196 Do the tests with the tabulated Laplace transforms from EqWorld
1198 *******************************************************************************/
1200 (kill(all), assume(s>0, a>0, b>0, n>0, nu>-1), declare(n,integer, nu,real));
1203 /*******************************************************************************
1205 Expressions with Power-Law Functions
1207 *******************************************************************************/
1209 /* Problem 149: No. 1 OK */
1211 specint(%e^(-s*t),t);
1214 /* Problem 150: No. 2 OK New
1215 This is an example for the step function u(t).
1216 We have implemented an algorithm with unit_step.
1219 specint(%e^(-s*t)*(unit_step(t-a)-unit_step(t-b)),t);
1220 %e^-(a*s)/s-%e^-(b*s)/s;
1222 /* Problem 151: No. 3 OK */
1224 specint(%e^(-s*t)*t,t);
1227 /* Problem 152: No. 4 OK New
1228 The result of Maxima is equivalent to the
1229 tabulated result: -%e^(a*s)*ei(-a*p)
1232 specint(%e^(-s*t)*(t+a)^-1,t);
1233 gamma_incomplete(0,a*s)*%e^(a*s);
1235 /* Problem 153: No. 5 OK */
1237 specint(%e^(-s*t)*t^n,t);
1240 /* Problem 154: No. 6 OK */
1242 specint(%e^(-s*t)*t^(n-1/2),t);
1243 gamma(n+1/2)/s^(1/2+n);
1245 /* Problem 155: No. 7 OK New
1246 With gamma_incomplete(1/2,a*s)=sqrt(%pi)*erfc(sqrt(a*s)) the result of
1247 Maxima is equivalent to the
1248 tabulated result: sqrt(%pi/s)*%e^(a*s)*erfc(sqrt(a*s));
1251 specint(%e^(-s*t)/sqrt(t+a),t);
1252 gamma_incomplete(1/2,a*s)*%e^(a*s)/sqrt(s);
1254 /* Problem 156: No. 8 OK New
1255 tabulated result: sqrt(%pi/s)-%pi*sqrt(a)*%e^(a*s)*erfc(sqrt(a*s))
1258 radcan(specint(%e^(-s*t)*sqrt(t)/(t+a),t));
1259 (sqrt(a)*(%pi*erf(sqrt(a)*sqrt(s))-%pi)*sqrt(s)*%e^(a*s)+sqrt(%pi))/sqrt(s);
1261 /* Problem 157: No. OK New
1262 With gamma_incomplete(-1/2,z)=2*e^-z/sqrt(z)-2*sqrt(%pi)*erfc(sqrt(z))
1263 the result of Maxima is equivalent to the
1264 Tabulated result: 2*a^(-1/2)-2*(%pi*s)^(1/2)*%e^(a*s)*erfc(sqrt(a*s))
1267 specint(%e^(-s*t)*(t+a)^(-3/2),t);
1268 gamma_incomplete(-1/2,a*s)*sqrt(s)*%e^(a*s);
1270 /* Problem 158: No. 10 OK New
1271 Tabulated result: (%pi/s)^(1/2)-%pi*a^(1/2)*e^(a*s)*erfc(sqrt(a*s));
1274 radcan(specint(%e^(-s*t)*t^(1/2)*(t+a)^(-1),t));
1275 (sqrt(a)*(%pi*erf(sqrt(a)*sqrt(s))-%pi)*sqrt(s)*%e^(a*s)+sqrt(%pi))/sqrt(s);
1277 /* Problem 159: No. 11 OK New
1278 Tabulated result: %pi*a^(1/2)*e^(a*s)*erfc(sqrt(a*s));
1281 radcan(specint(%e^(-s*t)*t^(-1/2)*(t+a)^(-1),t));
1282 -((%pi*erf(sqrt(a)*sqrt(s))-%pi)*%e^(a*s)/sqrt(a));
1284 /* Problem 160: No. 12 OK */
1286 specint(%e^(-s*t)*t^nu,t);
1287 gamma(nu+1)/s^(nu+1);
1289 /* Problem 161: No. 13 OK New
1290 Tabulated result: s^(-nu-1)*%e^(a*s)*gamma_incomplete(nu+1,a*s)
1293 specint(%e^(-s*t)*(t+a)^nu,t);
1294 gamma_incomplete(nu+1,a*s)*s^(-nu-1)*%e^(a*s);
1296 /* Problem 162: No. 14 Ok New
1298 gamma_incomplete(-v,a*s) = gamma(-v,a*s) - gamma_greek(-v,a*s) and
1299 gamma(v+1) = v * gamma(v)
1300 the result of Maxima can be shown to be equivalent ot the
1301 tabulated result: a^nu*gamma(nu+1)*e^(a*s)*gamma_incomplete(-nu,a*s);
1304 radcan(specint(%e^(-s*t)*t^nu*(t+a)^(-1),t));
1305 (a^nu*gamma(-nu)*gamma(nu+1)-a^nu*nu*gamma_greek(-nu,a*s)*gamma(nu))*%e^(a*s);
1307 /*******************************************************************************
1309 Expressions with Exponential Functions
1311 *******************************************************************************/
1313 /* Problem 163: No. 1 OK */
1315 specint(%e^(-s*t)*%e^(-a*t),t);
1318 /* Problem 164: No. 2 OK */
1320 specint(%e^(-s*t)*t*%e^(-a*t),t);
1323 /* Problem 165: No. 3 OK */
1325 (assume(nu>0), specint(%e^(-s*t)*t^(nu-1)*%e^(-a*t),t));
1326 gamma(nu)*(s+a)^(-nu);
1328 /* Problem 166: No. 4 OK New
1329 After extension of the algorithm we find the tabulated result.
1332 specint(%e^(-s*t)*(%e^(-a*t)-%e^(-b*t))/t,t);
1335 /* Problem 167: No. 5 OK New
1336 Tabulated result: (s+2*a)*log(s+2*a)+s*log(s)-2*(s+a)*log(s+a);
1339 specint(%e^(-s*t)*(1-%e^(-a*t))^2/t^2,t);
1340 (s+2*a)*log(s+2*a)+s*log(s)-2*(s+a)*log(s+a);
1342 /* Problem 168: No. 6 OK */
1344 factor(radcan(specint(%e^(-s*t)*%e^(-a*t^2),t)));
1345 - (sqrt(%pi)*%e^(s^2/(4*a))*(erf(s/(2*sqrt(a)))-1))/(2*sqrt(a));
1347 /* Problem 169: No. 7 OK */
1349 factor(expand(radcan(specint(%e^(-s*t)*t*%e^(-a*t^2),t))));
1350 (sqrt(%pi)*s*%e^(s^2/(4*a))*erf(s/(2*sqrt(a)))-sqrt(%pi)*s*%e^(s^2/(4*a))+2*sqrt(a))/(4*a^(3/2));
1352 /* Problem 170: No. 8 OK */
1354 specint(%e^(-s*t)*%e^(-a/t),t);
1355 2*sqrt(a/s)*bessel_k(1,2*sqrt(a*s));
1357 /* Problem 171: No. 9 OK */
1359 block([besselexpand:true,exponentialize:true],radcan(specint(%e^(-s*t)*sqrt(t)*%e^(-a/t),t)));
1360 ((2*sqrt(%pi)*sqrt(a)*sqrt(s)+sqrt(%pi))*%e^(-2*sqrt(a)*sqrt(s)))/(2*s^(3/2));
1362 /* Problem 172: No. 10 OK */
1364 block([besselexpand:true,exponentialize:true],radcan(specint(%e^(-s*t)/sqrt(t)*%e^(-a/t),t)));
1365 sqrt(%pi/s)*%e^(-2*sqrt(a*s));
1367 /* Problem 173: No. 11 OK */
1369 block([besselexpand:true,exponentialize:true],radcan(specint(%e^(-s*t)/(t*sqrt(t))*%e^(-a/t),t)));
1370 sqrt(%pi/a)*%e^(-2*sqrt(a*s));
1372 /* Problem 174: No. 12 OK
1373 We calculate for an integer to prevent the conversion to bessel_i.
1376 factor(specint(%e^(-s*t)*t^(n-1)*%e^(-a/t),t));
1377 2*a^(n/2)*bessel_k(n,2*sqrt(a)*sqrt(s))/s^(n/2);
1379 /* Problem 175: No. 13 OK
1380 Answer of EqWorld is
1381 s^(-1)-(%pi*a)^(1/2)*s^(-3/2)*e^(a/s)*erfc(sqrt(a/s))
1384 radcan(specint(%e^(-s*t)*%e^(-2*sqrt(a*t)),t));
1385 (sqrt(%pi)*sqrt(a)*(erf(sqrt(a)/sqrt(s))-1)*%e^(a/s)+sqrt(s))/s^(3/2);
1387 /* Problem 176: No. 14 OK
1388 Result of EqWorld is (%pi/s)^(1/2)*%e^(a/s)*erfc(sqrt(a/s));
1389 Maxima doesn't convert erf(z)-1 -> erfc(z)
1392 radcan(specint(%e^(-s*t)/sqrt(t)*%e^(-2*sqrt(a*t)),t));
1393 -((sqrt(%pi)*(erf(sqrt(a)/sqrt(s))-1)*%e^(a/s))/sqrt(s));
1395 /*******************************************************************************
1397 Expressions with Trigonometric Functions
1399 *******************************************************************************/
1401 /* Problem 177: No. 1 OK */
1403 radcan(specint(%e^(-s*t)*sin(a*t),t));
1406 /* Problem 178: No. 2 (OK noun form New)
1407 We have no algorithm for the abs function
1408 Tabulated result: a/(s^2+a^2)*coth(%pi*s/(2*a));
1411 specint(%e^(-s*t)*(abs(sin(a*t))),t);
1412 'specint(%e^-(s*t)*abs(%e^(2*%i*a*t)-1),t)/2$
1414 /* Problem 179: No. 3 (OK noun form New)
1415 The result of EqWorld includes a product:
1416 a^(2*n)*(2*n)!/(s*product(s^2+(2*k*a)^2,k,1,n));
1419 specint(%e^(-s*t)*(sin(a*t))^(2*n),t);
1420 'specint((-1)^n*(%e^(2*%i*a*t)-1)^(2*n)*%e^(-s*t-2*%i*a*n*t),t)/2^(2*n);
1422 /* Problem 180: No. 4 (OK noun form New)
1423 The result of EqWorld includes a product:
1424 a^(2*n+1)*(2*n+1)!/((s^2+a^2)*product(s^2+(2*k+1)^2*a^2,k,1,n));
1427 factor(specint(%e^(-s*t)*(sin(a*t))^(2*n+1),t));
1430 specint(-%i*2^(-2*n-1)*(-1)^n*(%e^(2*%i*a*t)-1)^(2*n)*%e^(-s*t-2*%i*a*n*t+%i*a*t),t)+specint(%i*2^(-2*n-1)*(-1)^n*(%e^(2*%i*a*t)-1)^(2*n)*%e^(-s*t-2*%i*a*n*t-%i*a*t),t);
1433 'specint(-%i*2^(-2*n-1)*(-1)^n*(%e^(2*%i*a*t)-1)^(2*n)
1434 *%e^(-s*t-2*%i*a*n*t+%i*a*t),t)
1435 +'specint(%i*2^(-2*n-1)*(-1)^n*(%e^(2*%i*a*t)-1)^(2*n)
1436 *%e^(-s*t-2*%i*a*n*t-%i*a*t),t);
1438 /* Problem 181: No. 5 OK New */
1440 specint(%e^(-s*t)*t^n*sin(a*t),t);
1441 (%i*gamma(n+1)*(s+%i*a)^(-n-1)-%i*gamma(n+1)*(s-%i*a)^(-n-1))/2;
1443 /* Problem 182: No. 6 OK New
1444 Tabulated result: atan(a/s);
1445 This is equivalent to the result of Maxima after extension of the algorithm.
1448 specint(%e^(-s*t)*sin(a*t)/t,t);
1449 %i*log((s-%i*a)/(s+%i*a))/2;
1451 /* Problem 183: No. 7 OK New
1452 The result of Maxima is equivalent to the
1453 tabulated result: 1/4*log(1+4*a^2*s^(-2));
1456 radcan(specint(%e^(-s*t)/t*(sin(a*t))^2,t));
1457 (log(s^2+4*a^2)-2*log(s))/4;
1459 /* Problem 184: No. 8 OK New
1460 The result of Maxima can be shown to be equivalent to the
1461 tabulated result: a*atan(2*a/s)-1/4*s*log(1+4*a^2*p^(-2));
1464 expand(radcan(specint(%e^(-s*t)/t^2*(sin(a*t))^2,t)));
1465 -s*log(s+2*%i*a)/4-%i*a*log(s+2*%i*a)/2-s*log(s-2*%i*a)/4+%i*a*log(s-2*%i*a)/2+s*log(s)/2;
1467 /* Problem 185: No. 9 OK New
1468 We correct a bug in f35p147.
1471 radcan(specint(%e^(-s*t)*sin(2*sqrt(a*t)),t));
1472 sqrt(%pi)*sqrt(a)*%e^-(a/s)/s^(3/2);
1474 /* Problem 186: No. 10 (OK noun form New)
1475 For this Problem the test f35p147test fail.
1476 The exponent v is negativ. We have no algorithm for this case.
1477 Tabulated answer is:
1481 radcan(specint(%e^(-s*t)*sin(2*sqrt(a*t))/t,t));
1482 specint(-%i*%e^(2*%i*sqrt(a)*sqrt(t)-s*t)/(2*t),t)+specint(%i*%e^(-s*t-2*%i*sqrt(a)*sqrt(t))/(2*t),t);
1484 /* Problem 187: No. 11 OK */
1486 radcan(specint(%e^(-s*t)*cos(a*t),t));
1489 /* Problem 188: No. 12 OK */
1491 radcan(specint(%e^(-s*t)*(cos(a*t))^2,t));
1492 (s^2+2*a^2)/(s^3+4*a^2*s);
1494 /* Problem 189: No. 13 (OK Result is not verified.)
1495 Maxima get a result, but we can't verify it. See Problem 33.
1497 n!*s^(n+1)/(s^2+a^2)^(n+1)*sum((-1)^k*C[2*k+1,n+1]((a/s)^(2*k)),k,0,n);
1500 radcan(specint(%e^(-s*t)*t^n*cos(a*t),t));
1501 ((s+%i*a)^n*(gamma(n+1)*s+%i*a*gamma(n+1))+(s-%i*a)^n*(gamma(n+1)*s-%i*a*gamma(n+1)))/((s-%i*a)^n*(s+%i*a)^n*(2*s^2+2*a^2));
1503 /* Problem 190: No. 14 OK New*/
1505 specint(%e^(-s*t)*(1-cos(a*t))/t,t);
1506 1/2*log(1+a^2*s^(-2));
1508 /* Problem 191: No. 15 OK New
1509 The result of Maxima is equivalent to the tabulated result:
1510 1/2*log((s^2+b^2)/(s^2+a^2));
1513 radcan(specint(%e^(-s*t)/t*(cos(a*t)-cos(b*t)),t));
1514 (log(s+%i*b)+log(s-%i*b)-log(s+%i*a)-log(s-%i*a))/2;
1516 /* Problem 192: No. 16 OK New*/
1518 radcan(specint(%e^(-s*t)*sqrt(t)*cos(2*sqrt(a*t)),t));
1519 1/2*%pi^(1/2)*s^(-5/2)*(s-2*a)*%e^(-a/s);
1521 /* Problem 193: No. 17 OK New
1522 After correction of a bug Maxima gets the correct answer.
1525 radcan(specint(%e^(-s*t)/sqrt(t)*cos(2*sqrt(a*t)),t));
1526 sqrt(%pi/s)*%e^(-a/s);
1528 /* Problem 194: No. 18 OK */
1530 factor(radcan(specint(%e^(-s*t)*sin(a*t)*sin(b*t),t)));
1531 2*a*b*s/((s^2+(b^2-2*a*b+a^2))*(s^2+(b^2+2*a*b+a^2)));
1533 /* Problem 195: No. 19 OK */
1535 factor(radcan(specint(%e^(-s*t)*cos(a*t)*sin(b*t),t)));
1536 (b*(s^2+b^2-a^2))/((s^2+(b^2-2*a*b+a^2))*(s^2+(b^2+2*a*b+a^2)));
1538 /* Problem 196: No. 20 OK */
1540 factor(radcan(specint(%e^(-s*t)*cos(a*t)*cos(b*t),t)));
1541 (s*(s^2+a^2+b^2))/((s^2+b^2-2*a*b+a^2)*(s^2+b^2+2*a*b+a^2));
1543 /* Problem 197: No. 21 OK */
1545 (assume(s-b>0), factor(radcan(specint(%e^(-s*t)*%e^(b*t)*sin(a*t),t))));
1546 a/(s^2-2*b*s+b^2+a^2);
1548 /* Problem 198: No. 22 OK */
1550 factor(radcan(specint(%e^(-s*t)*%e^(b*t)*cos(a*t),t)));
1551 (s-b)/(s^2-2*b*s+b^2+a^2);
1553 /*******************************************************************************
1555 Expressions with Hyperbolic Functions
1557 *******************************************************************************/
1559 /* Problem 199: No. 01 OK */
1561 (assume(s-a>0), radcan(specint(%e^(-s*t)*sinh(a*t),t)));
1564 /* Problem 200: No. 02 OK */
1566 (assume(s-2*a>0),radcan(specint(%e^(-s*t)*(sinh(a*t))^2,t)));
1567 2*a^2/(s^3-4*a^2*s);
1569 /* Problem 201: No. 03 OK New
1570 Correct after correction of the code.
1573 radcan(specint(%e^(-s*t)/t*sinh(a*t),t));
1574 (log(s+a)-log(s-a))/2;
1576 /* Problem 202: No. 04 OK */
1578 factor(radcan(specint(%e^(-s*t)*t^(nu-1)*sinh(a*t),t)));
1579 gamma(nu)*((s+a)^nu-(s-a)^nu)/(2*(s-a)^nu*(s+a)^nu);
1581 /* Problem 203: No. 05 OK New
1582 Maxima gives the wrong result 0.
1583 Correct after bug fix.
1586 radcan(specint(%e^(-s*t)*sinh(2*sqrt(a*t)),t));
1587 sqrt(%pi)*sqrt(a)*%e^(a/s)/s^(3/2);
1589 /* Problem 204: No. 06 (OK Sign? New)
1591 %pi^(1/2)*s^(-5/2)*(1/2*s+a)*%e^(a/s)*erf(sqrt(a/s))-a^(1/2)*s^(-2);
1592 After bug fix nearly the tabulated answer.
1593 The last term of the result has a different sign. What's wrong???
1594 All other examples are correct with the corrected code!
1595 No equivalent example by A&S. But sinh(2*sqrt(a*t)) and a lot of
1596 other examples can be shown to be correct. I think EqWorld is wrong.
1599 factor(radcan(specint(%e^(-s*t)*sqrt(t)*sinh(2*sqrt(a*t)),t)));
1600 (sqrt(%pi)*erf(sqrt(a)/sqrt(s))*s*%e^(a/s)+2*sqrt(%pi)*a*erf(sqrt(a)/sqrt(s))*%e^(a/s)+2*sqrt(a)*sqrt(s))/(2*s^(5/2));
1602 /* Problem 205: No. 07 OK New
1603 Correct after bug fix
1606 factor(radcan(specint(%e^(-s*t)/sqrt(t)*sinh(2*sqrt(a*t)),t)));
1607 %pi^(1/2)*s^(-1/2)*%e^(a/s)*erf(sqrt(a/s));
1609 /* Problem 206: No. 08 (OK extra factor New)
1610 The result looks perfect, but in the tabulated answer a factor of 4
1611 in the exponent is missing. What's wrong???
1613 1/2*%pi^(1/2)*s^(-1/2)*(%e^(a/s)-1);
1614 I think EqWorld is wrong.
1617 radcan(specint(%e^(-s*t)*(sinh(2*sqrt(a*t)))^2/sqrt(t),t));
1618 sqrt(%pi)*(%e^(4*a/s)-1)/(2*sqrt(s)); /* Extra factor 4 ??? */
1620 /* Problem 207: No. 09 OK */
1622 factor(radcan(specint(%e^(-s*t)*cosh(a*t)^2,t)));
1623 (s^2-2*a^2)/(s*(s-2*a)*(s+2*a));
1625 /* Problem 208: No. 10 OK */
1627 factor(radcan(specint(%e^(-s*t)*cosh(a*t)^2,t)));
1628 (s^2-2*a^2)/(s*(s-2*a)*(s+2*a));
1630 /* Problem 209: No. 11 OK */
1632 factor(radcan(specint(%e^(-s*t)*t^(nu-1)*cosh(a*t),t)));
1633 gamma(nu)*((s+a)^nu+(s-a)^nu)/(2*(s-a)^nu*(s+a)^nu);
1635 /* Problem 210: No. 12 OK New*/
1637 radcan(specint(%e^(-s*t)*cosh(2*sqrt(a*t)),t));
1638 (sqrt(%pi)*sqrt(a)*erf(sqrt(a)/sqrt(s))*%e^(a/s)+sqrt(s))/s^(3/2);
1640 /* Problem 211: No. 13 OK New
1641 Maxima gives the result:
1642 -(sqrt(%pi)*((erf(sqrt(a)/sqrt(s))-1)*s+2*a*erf(sqrt(a)/sqrt(s))-2*a)
1644 +2*sqrt(a)*sqrt(s))/(2*s^(5/2))
1645 We have again the erf function in the result.
1646 The result is now correct.
1649 radcan(specint(%e^(-s*t)*sqrt(t)*cosh(2*sqrt(a*t)),t));
1650 sqrt(%pi)*(s+2*a)*%e^(a/s)/(2*s^(5/2));
1652 /* Problem 212: No. 14 OK New
1653 Maxima gives the result:
1654 -sqrt(%pi)*(erf(sqrt(a)/sqrt(s))-1)*%e^(a/s)/sqrt(s)
1655 Again the erf function.
1659 radcan(specint(%e^(-s*t)/sqrt(t)*cosh(2*sqrt(a*t)),t));
1660 sqrt(%pi)*%e^(a/s)/sqrt(s);
1662 /* Problem 213: No. 15 (OK but additional factor ? New)
1663 Maxima gives the result:
1664 (sqrt(s+4*a)*(2*sqrt(%pi)*sqrt(s-4*a)+sqrt(%pi)*sqrt(s))
1665 + sqrt(%pi)*sqrt(s)*sqrt(s-4*a))
1666 /(4*sqrt(s)*sqrt(s-4*a)*sqrt(s+4*a))$
1667 The result doesn't contain the requiered exponential function.
1668 Now correct. But there is an extra factor 4 in the exponent.
1669 I think EqWorld is wrong.
1672 radcan(specint(%e^(-s*t)*cosh(2*sqrt(a*t))^2/sqrt(t),t));
1673 1/2*%pi^(1/2)*s^(-1/2)*(%e^(4*a/s)+1);
1675 /*******************************************************************************
1677 Expressions with Logarithmic Functions
1679 *******************************************************************************/
1681 /* Problem 214: No. 01 OK New*/
1683 radcan(specint(%e^(-s*t)*log(t),t));
1684 -(1/s)*(log(s)+%gamma);
1686 /* Problem 215: No. 02 (Ok noun form)
1687 Tabulated result: -(1/s)*%e^(s/a)*ei(-s/a);
1690 radcan(specint(%e^(-s*t)*log(1+a*t),t));
1691 'specint(%e^-(s*t)*log(a*t+1),t);
1693 /* Problem 216: No. 03 (OK noun form New)
1694 Tabulated result: 1/s*(log(a)-%e^(a*s)*ei(-a*s));
1697 radcan(specint(%e^(-s*t)*log(t+a),t));
1698 specint(%e^(-s*t)*log(t+a),t);
1700 /* Problem 217: No. 04 OK New
1701 Tabulated result is equivalent to Maxima result.
1702 n!/s^(n+1)*(sum(1/k,1,n)-log(s)-%gamma);
1705 radcan(specint(%e^(-s*t)*t^n*log(t),t));
1706 -s^(-n-1)*(gamma(n+1)*log(s)-psi[0](n+1)*gamma(n+1));
1708 /* Problem 218: No. 05 OK New*/
1710 radcan(specint(%e^(-s*t)*log(t)/sqrt(t),t));
1711 -(sqrt(%pi)*(log(s)+2*log(2)+%gamma)/sqrt(s));
1713 /* Problem 219: No. 06 OK New*/
1715 radcan(specint(%e^(-s*t)*t^(n-1/2)*log(t),t));
1716 -((gamma((2*n+1)/2)*log(s)-psi[0]((2*n+1)/2)*gamma((2*n+1)/2))/s^((2*n+1)/2));
1718 /* Problem 220: No. 07 OK New*/
1720 radcan(specint(%e^(-s*t)*t^(nu-1)*log(t),t));
1721 -((gamma(nu)*log(s)-psi[0](nu)*gamma(nu))/s^nu);
1723 /* Problem 221: No. 08 (OK noun form New)
1724 1/s*((log(x)+%gamma)^2+1/6*%pi^2);
1727 radcan(specint(%e^(-s*t)*log(t)^2,t));
1728 specint(%e^(-s*t)*log(t)^2,t);
1730 /* Problem 222: No. 09 OK New*/
1732 radcan(specint(%e^(-s*t)*%e^(-a*t)*log(t),t));
1733 -((log(s+a)+%gamma)/(s+a));
1735 /*******************************************************************************
1737 Expressions with Error Functions
1739 *******************************************************************************/
1741 /* Problem 223: No. 01 (OK noun form New)
1743 1/s*%e^((1/(2*a))^2*s^2)*erfc((1/(2*a))*s);
1744 No result. Is the noun form correct. Why do we get the function abs in the
1748 radcan(specint(%e^(-s*t)*erf(a*t),t));
1749 specint(%e^(-s*t)*erf(a*t),t);
1751 /* Problem 224: No. 02 OK */
1753 radcan(specint(%e^(-s*t)*erf(sqrt(a*t)),t));
1754 sqrt(a)/(s*sqrt(s+a));
1756 /* Problem 225: No. 03 OK */
1758 radcan(specint(%e^(-s*t)*%e^(a*t)*erf(sqrt(a*t)),t));
1759 sqrt(a)/(sqrt(s)*(s-a));
1761 /* Problem 226: No. 04 NEW Noun form
1763 (sqrt(a)*sqrt(s)*sqrt(4-a*s)+4*asin(sqrt(a)*sqrt(s)/2))/(4*s)
1764 But there is no asin function in the expected answer.
1765 I can't verify the answer of Maxima.
1766 We declare this to an Error until verification of the problem.
1768 This is a bug. The argument of the hypergeometric function for this example
1769 is 1/t. For an argument with a negavtive power the alogrithm for the
1770 Laplace transform is not correct.
1773 specint(%e^(-s*t)*erf(sqrt(a)/sqrt(t)/2),t);
1774 /*1/s*(1-%e^(-sqrt(a*s)));*/
1775 'specint(%e^(-s*t)*erf(sqrt(a)/sqrt(t)/2),t);
1777 /* Problem 227: No. 05 OK */
1779 radcan(specint(%e^(-s*t)*erfc(sqrt(a*t)),t));
1780 (sqrt(s+a)-sqrt(a))/(s*sqrt(s+a));
1782 /* Problem 228: No. 06 OK */
1784 radcan(specint(%e^(-s*t)*%e^(a*t)*erfc(sqrt(a*t)),t));
1787 /* Problem 229: No. 07 (OK noun form New)
1788 The same as Problem 226.
1789 For this case erfc is transformed to an expression with Whittaker M
1790 functions. The Laplace transform fails and we get "2 'other-ca-later".
1791 Extension of the code to return a noun form.
1792 EqWorld: 1/s*%e^(-sqrt(a*s));
1795 radcan(specint(%e^(-s*t)*%e^(a*t)*erfc(sqrt(a/t)/2),t));
1796 'specint(erfc(sqrt(a)/(2*sqrt(t)))*%e^((a-s)*t),t);
1798 /*******************************************************************************
1800 Expressions with Bessel and Modified Bessel Functions
1802 *******************************************************************************/
1804 /* Problem 230: No. 01 OK */
1806 radcan(specint(%e^(-s*t)*bessel_j(0,a*t),t));
1809 /* Problem 231: No. 02 OK */
1811 radcan(specint(%e^(-s*t)*bessel_j(nu,a*t),t));
1812 a^nu/(sqrt(s^2+a^2)*(sqrt(s^2+a^2)+s)^nu);
1814 /* Problem 232: No. 03 (OK)
1815 Thats the same result as Problem 233, because Maxima don't distinguish
1816 real and integer order of the Bessel function.
1817 But we have a problem with a factor 1/2, see Problem 86.
1818 I think EqWorld is wrong.
1821 radcan(specint(%e^(-s*t)*t^n*bessel_j(n,a*t),t));
1822 a^n*gamma(2*n+1)/(2^n*gamma(n+1)*(s^2+a^2)^((2*n+1)/2));
1824 /* Problem 233: No. 04 (OK)
1825 We can show that the Maxima result is equivalent to
1826 (1/2) * 2^nu/sqrt(%pi)*gamma(nu+1/2)*a^nu*(s^2+a^2)^(-nu-1/2)
1827 That differs by a factor of 1/2 from the tabulated result of EqWorld:
1828 2^nu*%pi^((-1)/2)*gamma(1/2+nu)*a^nu*(a^2+s^2)^(-1/2-nu);
1829 I think Eqworld is wrong. See also Problem: 241
1832 radcan(specint(%e^(-s*t)*t^nu*bessel_j(nu,a*t),t));
1833 a^nu*gamma(2*nu+1)/(2^nu*gamma(nu+1)*(s^2+a^2)^((2*nu+1)/2));
1835 /* Problem 234: No. 05 OK
1836 For this case we can verify the Maxima result. It is equivalent to
1837 the tabulated solution:
1838 2^nu*%pi^(-1/2)*gamma(nu+1/2)*a^nu*(s^2+a^2)^(-nu-1/2)
1841 radcan(specint(%e^(-s*t)*t^(nu+1)*bessel_j(nu,a*t),t));
1842 a^nu*gamma(2*nu+2)*s/((s^2+a^2)^((2*nu+1)/2)*(2^nu*gamma(nu+1)*s^2+a^2*2^nu*gamma(nu+1)));
1844 /* Problem 235: No. 06 OK */
1846 radcan(specint(%e^(-s*t)*bessel_j(0,2*sqrt(a*t)),t));
1849 /* Problem 236: No. 07 OK */
1851 radcan(specint(%e^(-s*t)*sqrt(t)*bessel_j(1,2*sqrt(a*t)),t));
1852 sqrt(a)/s^2*%e^(-a/s);
1854 /* Problem 237: No. 08 OK */
1856 radcan(specint(%e^(-s*t)*t^(nu/2)*bessel_j(nu,2*sqrt(a*t)),t));
1857 a^(nu/2)*s^(-nu-1)*%e^(-a/s);
1859 /* Problem 238: No. 09 (OK noun form New)
1860 Maxima gives the result:
1861 1/sqrt(s^2+a^2*b+a^2)
1862 But the answer of EqWorld contains an exponential function.
1864 We have a bug in the routine dionarghyp and following. After transformation
1865 to a hypergeometric function we have an argument of the form (t^2+b*t).
1866 Maxima doesn't recognize the two terms of the argument correctly.
1867 After specialization of the pattern and correcting the return
1868 value of the routine execargmatch and execf19 we get a correct noun.
1869 1/sqrt(s^2+a^2)*%e^(b*s-b*sqrt(s^2+a^2));
1872 radcan(specint(%e^(-s*t)*bessel_j(0,a*sqrt(t^2+b*t)),t));
1873 'specint(bessel_j(0,a*sqrt(t)*sqrt(t+b))*%e^(-s*t),t);
1875 /* Problem 239: No. 10 OK */
1877 radcan(specint(%e^(-s*t)*bessel_i(0,a*t),t));
1878 1/(sqrt(s-a)*sqrt(s+a));
1880 /* Problem 240: No. 11 OK New*/
1882 radcan(specint(%e^(-s*t)*bessel_i(nu,a*t),t));
1883 a^nu/((sqrt(s-a)*sqrt(s+a))*(sqrt(s-a)*sqrt(s+a)+s)^nu);
1885 /* Problem 241: No. 12 OK New
1886 But the result differs by a factor 1/2. See problem: 233.
1888 Tabulated result: 2^nu*%pi^(-1/2)*gamma(nu+1/2)*a^nu*(s^2-a^2)^(-nu-1/2);
1889 The tabuluated result of EqWorld is wrong. The first factor should be
1890 2^(nu-1). We have verified the result with the help of A&S 29.3.60.
1891 I think EqWorld is wrong.
1894 radcan(specint(%e^(-s*t)*t^nu*bessel_i(nu,a*t),t));
1895 a^nu*gamma(2*nu+1)/(2^nu*gamma(nu+1)*(s-a)^((2*nu+1)/2)*(s+a)^((2*nu+1)/2));
1897 /* Problem 242: No. 13 OK New
1898 The result is equivalent to the tabulated solution:
1899 2^(nu+1)*%pi^(1/2)*gamma(nu+3/2)*a^nu*s*(s^2-a^2)^(-nu-3/2);
1902 radcan(specint(%e^(-s*t)*t^(nu+1)*bessel_i(nu,a*t),t));
1903 a^nu*gamma(2*nu+2)*s/((s-a)^((2*nu+1)/2)*(s+a)^((2*nu+1)/2)*(2^nu*gamma(nu+1)*s^2-a^2*2^nu*gamma(nu+1)));
1905 /* Problem 243: No. 14 OK */
1907 radcan(specint(%e^(-s*t)*bessel_i(0,2*sqrt(a*t)),t));
1910 /* Problem 244: No. 15 OK */
1912 block([besselexpand:true],expand(exponentialize(radcan(specint(%e^(-s*t)*bessel_i(1,2*sqrt(a*t))/sqrt(t),t)))));
1913 %e^(a/s)/sqrt(a)-1/sqrt(a);
1915 /* Problem 245: No. 16 OK New*/
1917 radcan(specint(%e^(-s*t)*t^(nu/2)*bessel_i(nu,2*sqrt(a*t)),t));
1918 a^(nu/2)*s^(-nu-1)*%e^(a/s);
1920 /* Problem 246: No. 17 OK
1921 The tabulated result -2/%pi*asinh(s/a)/sqrt(s^2+a^2) is equivalent to
1922 the result of Maxima.
1925 specint(%e^(-s*t)*bessel_y(0,a*t),t);
1926 -log((sqrt(s^2+a^2)+s)/(sqrt(s^2+a^2)-s))/(%pi*sqrt(s^2+a^2));
1928 /* Problem 247: No. 18 OK New (10/2009)
1929 * A special algorithm for bessel_k(0,a*t) has been added.
1932 specint(%e^(-s*t)*bessel_k(0,a*t),t);
1933 acosh(s/a)/sqrt(s^2-a^2);
1935 /*******************************************************************************
1937 * Bug ID: 2858045 - Laplace transform of asin or atan gives wrong noun form
1938 * Check the correct noun for the asin and atan function.
1941 specint(%e^(-s*t)*asin(t),t);
1942 'specint(%e^(-s*t)*asin(t),t);
1944 specint(%e^(-s*t)*atan(t),t);
1945 'specint(%e^(-s*t)*atan(t),t);
1947 /* The results for an argument 1/sqrt(t) have to be checked.
1949 * The following results are wrong. The algorithm to integrate the
1950 * hypergeometric function only works for an argument t^n where n is positive
1951 * integer. We have asin(z) = z * F(1/2,1/2; 3/2; z^2), therefore the argument
1952 * of the hypergeometric function is 1/t.
1955 specint(%e^(-s*t)*asin(1/sqrt(t)),t);
1956 /*sqrt(%pi)*%f[3,1]([1/2,1/2,-1/2],[3/2],-s)/sqrt(s);*/
1957 'specint(%e^(-s*t)*asin(1/sqrt(t)),t);
1959 specint(%e^(-s*t)*atan(1/sqrt(t)),t);
1960 /*sqrt(%pi)*%f[3,1]([1/2,1,-1/2],[3/2],s)/sqrt(s);*/
1961 'specint(%e^(-s*t)*atan(1/sqrt(t)),t);
1962 /*******************************************************************************
1964 * Bug ID: 2864588 - specint(exp(-s*t)*bessel_i(1/2,t)^2,t) not correct
1966 * The Laplace transform of the square of the bessel_i(1/2,t) function is equal
1967 * to the Laplace transform of the expanded form 2*sinh(t)^2/(%pi*t).
1970 specint(exp(-s*t)*bessel_i(1/2,t)^2,t),besselexpand:false;
1971 -log(1-4/s^2)/(2*%pi);
1973 specint(exp(-s*t)*bessel_i(1/2,t)^2,t),besselexpand:true;
1974 -log(1-4/s^2)/(2*%pi);
1976 /*******************************************************************************
1978 * Bug ID: 2866802 - specint(exp(-s*t)*t^(5/2)*bessel_j(-1/2,sqrt(t))^2,t) wrong
1980 * We add two tests to show that the square of bessel_j(v,t) works for
1981 * v=-1/2 (the orignally bug) and v=1/2 as expected.
1984 res:factor(ratsimp(specint(exp(-s*t)*t*bessel_j(-1/2,t)^2,t))),
1986 2*(s^2+2)/(%pi*s*(s^2+4));
1988 expand(res-ratsimp(specint(exp(-s*t)*t*bessel_j(-1/2,t)^2,t))),
1992 res:factor(ratsimp(specint(exp(-s*t)*t*bessel_j(1/2,t)^2,t))),
1996 expand(res-ratsimp(specint(exp(-s*t)*t*bessel_j(1/2,t)^2,t))),
2000 /*******************************************************************************
2002 * BUG ID: 2867499 -specint(exp(-s*t)*CONST*t^2*bessel_y(1,t),t) wrong
2004 * Show that a constant term is not lost in the Laplace transform
2007 factor(ratsimp(specint(exp(-s*t)*CONST*t^2*bessel_y(1,t),t)));
2008 (3*s*log((sqrt(s^2+1)+s)/(sqrt(s^2+1)-s))
2009 +2*s^2*sqrt(s^2+1)-4*sqrt(s^2+1))
2011 /(%pi*(s^2+1)^(5/2));
2013 /*******************************************************************************
2015 * Bug ID: 2867434 - specint(exp(-s*t)*t^2*%h[1,1](t),t) does not work
2017 * Show that the Laplace transform of Hankel functions work for an integer order
2020 res1:factor(ratsimp(specint(exp(-s*t)*t^2*hankel_1(1,t),t)));
2021 (3*%i*s*sqrt(s^2+1)*log((sqrt(s^2+1)+s)/(sqrt(s^2+1)-s))
2022 +3*%pi*s*sqrt(s^2+1)+2*%i*s^4-2*%i*s^2-4*%i)
2025 res2:factor(ratsimp(specint(exp(-s*t)*t^2*hankel_2(1,t),t)));
2026 (3*%i*s*sqrt(s^2+1)*log((sqrt(s^2+1)+s)/(sqrt(s^2+1)-s))
2027 -3*%pi*s*sqrt(s^2+1)+2*%i*s^4-2*%i*s^2-4*%i)
2031 /* Proof that the results are equivalent to the Laplace transforms of
2032 bessel_j and bessel_y.
2035 ratsimp(specint(exp(-s*t)*t^2*bessel_j(1,t),t) - 1/2*(res1+res2));
2037 ratsimp(specint(exp(-s*t)*t^2*bessel_y(1,t),t) - 1/(2*%i)*(res1-res2));
2040 /*******************************************************************************
2042 * We know the following Laplace transform of the Parabolic Cylinder D function:
2043 * (functions.wolfram.com)
2045 * t^(a-1)*D[v](sqrt(t))
2046 * -> 2^(-a+v/2+1)*sqrt(%pi)*gamma(2*a)/gamma(a+(1-v)/2)
2047 * *2F1([a,a+1/2],[a+(1-v)/2],1/2-2*t)
2049 * Check this formula for some values.
2051 (assume(4*?psey-1>0, 4*s-1>0),done);
2054 (lt(a,v,z):=2^(-a+v/2+1)*sqrt(%pi)*gamma(2*a)/gamma(a+(1-v)/2)
2055 *hgfred([a,a+1/2],[a+(1-v)/2],1/2-2*z),done);
2058 res:factor(ratsimp(specint(exp(-s*t)*parabolic_cylinder_d(0,sqrt(t)),t)));
2061 res-factor(ratsimp(lt(1,0,s)));
2064 res:factor(ratsimp(specint(exp(-s*t)*parabolic_cylinder_d(1,sqrt(t)),t)));
2065 4*sqrt(%pi)/(4*s+1)^(3/2);
2067 res-factor(ratsimp(lt(1,1,s)));
2070 res:factor(ratsimp(specint(exp(-s*t)*parabolic_cylinder_d(2,sqrt(t)),t)));
2071 -4*(4*s-3)/(4*s+1)^2;
2073 res-factor(ratsimp(lt(1,2,s)));
2076 res:factor(ratsimp(specint(exp(-s*t)*t*parabolic_cylinder_d(2,sqrt(t)),t)));
2077 -16*(4*s-7)/(4*s+1)^3;
2079 res-factor(ratsimp(lt(2,2,s)));
2082 res:factor(ratsimp(specint(exp(-s*t)*t^2*parabolic_cylinder_d(2,sqrt(t)),t)));
2083 -128*(4*s-11)/(4*s+1)^4;
2085 ratsimp(res-factor(ratsimp(lt(3,2,s))));
2088 res:factor(ratsimp(specint(exp(-s*t)*parabolic_cylinder_d(1/2,sqrt(t)),t)));
2089 2^(3/2)*sqrt(%pi)*assoc_legendre_p(3/4,-1/4,sqrt(2)/sqrt(4*s+1))
2090 /((4*s-1)^(1/8)*(4*s+1)^(7/8));
2092 ratsimp(res-factor(ratsimp(lt(1,1/2,s))));
2095 /*******************************************************************************
2097 * BUG ID: 2867727 - specint: wrong result for Parabolic Cylinder D function
2099 * The Laplace transform for the Parabolic Cylinder D function should only
2100 * work for an argument a*sqrt(t). Check this.
2102 * But the Parabolic Cylinder D function has simple expansions for an
2103 * integer order and argument a*t:
2104 * parabolic_cylinder_d(0,z):=exp(-z^2/4),
2105 * parabolic_cylinder_d(1,z):=z*exp(-z^2/4)
2106 * We show the results for later improvement of the code.
2109 factor(ratsimp(specint(exp(-s*t)*exp(-t^2/4),t)));
2110 -sqrt(%pi)*%e^s^2*(erf(s)-1);
2112 factor(ratsimp(specint(exp(-s*t)*parabolic_cylinder_d(0,t),t)));
2113 'specint(exp(-s*t)*parabolic_cylinder_d(0,t),t);
2115 factor(ratsimp(specint(exp(-s*t)*t*exp(-t^2/4),t)));
2116 2*(sqrt(%pi)*s*%e^s^2*erf(s)-sqrt(%pi)*s*%e^s^2+1);
2118 factor(ratsimp(specint(exp(-s*t)*parabolic_cylinder_d(1,t),t)));
2119 'specint(exp(-s*t)*parabolic_cylinder_d(1,t),t);
2121 /*******************************************************************************
2123 * Test Laplace transform of whittaker_m
2125 * Check it against two simple special cases of whittaker_m:
2127 * whittaker_m(-1/2-u,u,z) = exp(z/2) * z^(u+1/2)
2128 * whittaker_m(1/2 +u,u,z) = exp(-z/2)* z^(u+1/2)
2131 (assume(s>0,2*u+3>0,2*s-1>0),done);
2134 res1:factor(ratsimp(specint(exp(-s*t)*whittaker_m(-1/2-u,u,t),t)));
2135 (2*s-1)^(-u-3/2)*2^(u+3/2)*gamma((2*u+3)/2);
2137 res2:factor(ratsimp(specint(exp(-s*t)*exp(t/2)*t^(u+1/2),t)));
2138 (2*s-1)^(-u-3/2)*2^(u+3/2)*gamma((2*u+3)/2);
2143 res1:factor(ratsimp(specint(exp(-s*t)*whittaker_m(1/2+u,u,t),t)));
2144 (2*s+1)^(-u-3/2)*2^(u+3/2)*gamma((2*u+3)/2);
2146 res2:factor(ratsimp(specint(exp(-s*t)*exp(-t/2)*t^(u+1/2),t)));
2147 (2*s+1)^(-u-3/2)*2^(u+3/2)*gamma((2*u+3)/2);
2152 /* The general solution for an argument t, with 2*a+2*u+1>0 */
2154 (assume(2*a+2*u+1>0),done);
2157 factor(ratsimp(specint(exp(-s*t)*t^(a-1)*whittaker_m(v,u,t),t)));
2158 (2*s+1)^(-u-a-1/2)*2^(u+a+1/2)*gamma((2*u+2*a+1)/2)
2159 *%f[2,1]([(2*v-2*u-1)/-2,(2*u+2*a+1)/2],[2*u+1],
2162 /* The general solution for an argument -t, with 2*a+2*u+1>0 */
2164 factor(ratsimp(specint(exp(-s*t)*t^(a-1)*whittaker_m(v,u,-t),t)));
2165 %i*(2*s-1)^(-u-a-1/2)*(-1)^u*2^(u+a+1/2)*gamma((2*u+2*a+1)/2)
2166 *%f[2,1]([(2*v-2*u-1)/-2,(2*u+2*a+1)/2],[2*u+1],-2/(2*s-1));
2168 /******************************************************************************/