assumptions: positive -> nonzero, zero -> nonpositive (#614)
treee4d8c4d6279dfdcac39dfe2c2642885516c07c0b
-rw-r--r-- 51 .hgignore
-rw-r--r-- 638 .hgtags
-rw-r--r-- 1509 LICENSE
-rw-r--r-- 196 MANIFEST.in
-rw-r--r-- 3799 README
-rw-r--r-- 262 TODO
drwxr-xr-x - bin
drwxr-xr-x - data
drwxr-xr-x - doc
drwxr-xr-x - examples
-rwxr-xr-x 8449 setup.py
drwxr-xr-x - sympy