From 58b849af4bcdabb6b2383d4de7de9eac01ef059a Mon Sep 17 00:00:00 2001
From: Werner LEMBERG <wl@gnu.org>
Date: Sat, 4 Dec 2004 11:55:12 +0000
Subject: [PATCH] * src/preproc/eqn/eqn.man: Revised.

---
 ChangeLog               |   4 +
 src/preproc/eqn/eqn.man | 359 ++++++++++++++++++++++++++++++++++++------------
 2 files changed, 275 insertions(+), 88 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 997d675f..65fde6db 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2004-12-04  Werner LEMBERG  <wl@gnu.org>
+
+	* src/preproc/eqn/eqn.man: Revised.
+
 2004-11-25  Werner LEMBERG  <wl@gnu.org>
 
 	* src/utils/xtotroff/xtotroff.c: Reformat to be similar to other
diff --git a/src/preproc/eqn/eqn.man b/src/preproc/eqn/eqn.man
index 6d0733c4..4f0696bd 100644
--- a/src/preproc/eqn/eqn.man
+++ b/src/preproc/eqn/eqn.man
@@ -1,5 +1,5 @@
 .ig
-Copyright (C) 1989-2000, 2001 Free Software Foundation, Inc.
+Copyright (C) 1989-2000, 2001, 2004 Free Software Foundation, Inc.
 
 Permission is granted to make and distribute verbatim copies of
 this manual provided the copyright notice and this permission notice
@@ -16,20 +16,34 @@ versions, except that this permission notice may be included in
 translations approved by the Free Software Foundation instead of in
 the original English.
 ..
-.ie \n(.V<\n(.v .ds tx T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
-.el .ds tx TeX
+.
+.
+.ie \n(.V<\n(.v \
+.  ds tx T\h'-.1667m'\v'.224m'E\v'-.224m'\h'-.125m'X
+.el \
+.  ds tx TeX
+.
+.
 .\" Like TP, but if specified indent is more than half
 .\" the current line-length - indent, use the default indent.
 .de Tp
-.ie \\n(.$=0:((0\\$1)*2u>(\\n(.lu-\\n(.iu)) .TP
-.el .TP "\\$1"
+.  ie \\n(.$=0:((0\\$1)*2u>(\\n(.lu-\\n(.iu)) .TP
+.  el .TP "\\$1"
 ..
+.
+.
 .\" The BSD man macros can't handle " in arguments to font change macros,
 .\" so use \(ts instead of ".
 .tr \(ts"
+.
+.
 .TH @G@EQN @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
+.
+.
 .SH NAME
 @g@eqn \- format equations for troff
+.
+.
 .SH SYNOPSIS
 .nr a \n(.j
 .ad l
@@ -38,8 +52,8 @@ the original English.
 .ti \niu
 .B @g@eqn
 .de OP
-.ie \\n(.$-1 .RI "[\ \fB\\$1\fP" "\\$2" "\ ]"
-.el .RB "[\ " "\\$1" "\ ]"
+.  ie \\n(.$-1 .RI "[\ \fB\\$1\fP" "\\$2" "\ ]"
+.  el .RB "[\ " "\\$1" "\ ]"
 ..
 .OP \-rvCNR
 .OP \-d xy
@@ -52,9 +66,12 @@ the original English.
 .RI "[\ " files\|.\|.\|. "\ ]"
 .br
 .ad \na
-.PP
+.
+.LP
 It is possible to have whitespace between a command line option and its
 parameter.
+.
+.
 .SH DESCRIPTION
 This manual page describes the GNU version of
 .BR eqn ,
@@ -69,13 +86,16 @@ Normally, it should be invoked using the
 option of
 .BR groff .
 The syntax is quite compatible with Unix eqn.
-The output of GNU eqn cannot be processed with Unix troff;
+The output of GNU
+.B eqn
+cannot be processed with Unix troff;
 it must be processed with GNU troff.
 If no files are given on the command line, the standard input
 will be read.
 A filename of
 .B \-
 will cause the standard input to be read.
+.
 .LP
 .B eqn
 searches for the file
@@ -87,25 +107,33 @@ option first, then in
 .BR @LOCALMACRODIR@ ,
 and finally in the standard macro directory
 .BR @MACRODIR@ .
-If it exists, eqn will process it before the other input files.
+If it exists,
+.B eqn
+will process it before the other input files.
 The
 .B \-R
 option prevents this.
+.
 .LP
-GNU eqn does not provide the functionality of neqn:
+GNU
+.B eqn
+does not provide the functionality of neqn:
 it does not support low-resolution, typewriter-like devices
 (although it may work adequately for very simple input).
+.
+.
 .SH OPTIONS
 .TP
 .BI \-d xy
 Specify delimiters
 .I x
-and
+and\~\c
 .I y
 for the left and right end, respectively, of in-line equations.
 Any
 .B delim
 statements in the source file overrides this.
+.
 .TP
 .B \-C
 Recognize
@@ -119,32 +147,38 @@ Don't allow newlines within delimiters.
 This option allows
 .B eqn
 to recover better from missing closing delimiters.
+.
 .TP
 .B \-v
 Print the version number.
+.
 .TP
 .B \-r
 Only one size reduction.
+.
 .TP
 .BI \-m n
-The minimum point-size is
+The minimum point-size is\~\c
 .IR n .
-eqn will not reduce the size of subscripts or superscripts to
-a smaller size than
+.B eqn
+will not reduce the size of subscripts or superscripts to
+a smaller size than\~\c
 .IR n .
+.
 .TP
 .BI \-T name
 The output is for device
 .IR name .
 The only effect of this is to define a macro
 .I name
-with a value of
+with a value of\~\c
 .BR 1 .
 Typically
 .B eqnrc
 will use this to provide definitions appropriate for the output device.
 The default output device is
 .BR @DEVICE@ .
+.
 .TP
 .BI \-M dir
 Search
@@ -152,82 +186,109 @@ Search
 for
 .B eqnrc
 before the default directories.
+.
 .TP
 .B \-R
 Don't load
 .BR eqnrc .
+.
 .TP
 .BI \-f F
 This is equivalent to a
 .BI gfont\  F
 command.
+.
 .TP
 .BI \-s n
 This is equivalent to a
 .BI gsize\  n
 command.
 This option is deprecated.
-eqn will normally set equations at whatever the current point size
+.B eqn
+will normally set equations at whatever the current point size
 is when the equation is encountered.
+.
 .TP
 .BI \-p n
 This says that subscripts and superscripts should be
-.I n
+.I n\~\c
 points smaller than the surrounding text.
 This option is deprecated. 
-Normally eqn makes sets subscripts and superscripts at 70% 
+Normally
+.B eqn
+makes sets subscripts and superscripts at 70% 
 of the size of the surrounding text.
+.
+.
 .SH USAGE
-Only the differences between GNU eqn and Unix eqn are described here.
+Only the differences between GNU
+.B eqn
+and Unix eqn are described here.
+.
 .LP
-Most of the new features of GNU eqn
+Most of the new features of GNU
+.B eqn
 are based on \*(tx.
-There are some references to the differences between \*(tx and GNU eqn below;
+There are some references to the differences between \*(tx and GNU
+.B eqn
+below;
 these may safely be ignored if you do not know \*(tx.
+.
 .SS Automatic spacing
-.LP
 .B eqn
 gives each component of an equation a type, and adjusts the spacing
 between components using that type.
 Possible types are:
+.
+.RS
 .TP \w'punctuation'u+2n
 ordinary
-an ordinary character such as 1 or
-.IR x ;
+an ordinary character such as `1' or `\c
+.IR x ';
+.
 .TP
 operator
 a large operator such as
-.ds Su \s+5\(*S\s0
+.ds Su `\s+5\(*S\s0'
 .if \n(.g .if !c\(*S .ds Su the summation operator
 \*(Su;
+.
 .TP
 binary
-a binary operator such as +;
+a binary operator such as `\(pl';
+.
 .TP
 relation
-a relation such as =;
+a relation such as `=';
+.
 .TP
 opening
-a opening bracket such as (;
+a opening bracket such as `(';
+.
 .TP
 closing
-a closing bracket such as );
+a closing bracket such as `)';
+.
 .TP
 punctuation
-a punctuation character such as ,;
+a punctuation character such as `,';
+.
 .TP
 inner
 a subformula contained within brackets;
 .TP
 suppress
 spacing that suppresses automatic spacing adjustment.
+.RE
+.
 .LP
 Components of an equation get a type in one of two ways.
+.
 .TP
 .BI type\  t\ e
-This yields an equation component that contains
+This yields an equation component that contains\~\c
 .I e
-but that has type
+but that has type\~\c
 .IR t ,
 where
 .I t
@@ -235,14 +296,17 @@ is one of the types mentioned above.
 For example,
 .B times
 is defined as
+.
 .RS
 .IP
 .B
 type "binary" \e(mu
 .RE
+.
 .IP
 The name of the type doesn't have to be quoted, but quoting protects
 from macro expansion.
+.
 .TP
 .BI chartype\  t\ text
 Unquoted groups of characters are split up into individual characters,
@@ -250,20 +314,20 @@ and the type of each character is looked up;
 this changes the type that is stored for each character;
 it says that the characters in
 .I text
-from now on have type
+from now on have type\~\c
 .IR t .
 For example,
+.
 .RS
 .IP
 .B
 chartype "punctuation" .,;:
 .RE
+.
 .IP
-would make the characters
-.B .,;:
-have type punctuation
+would make the characters `.,;:' have type punctuation
 whenever they subsequently appeared in an equation.
-The type
+The type\~\c
 .I t
 can also be
 .B letter
@@ -272,7 +336,10 @@ or
 in these cases
 .B chartype
 changes the font type of the characters.
-See the Fonts subsection.
+See the
+.B Fonts
+subsection.
+.
 .SS New primitives
 .TP
 .IB e1\  smallover\  e2
@@ -297,22 +364,25 @@ primitive in display styles;
 corresponds to
 .B \eover
 in non-display styles.
+.
 .TP
 .BI vcenter\  e
 This vertically centers
 .I e
 about the math axis.
 The math axis is the vertical position about which characters
-such as + and - are centered; also it is the vertical position
+such as `\(pl' and `\(mi' are centered; also it is the vertical position
 used for the bar of fractions.
 For example,
 .B sum
 is defined as
+.
 .RS
 .IP
 .B
 { type "operator" vcenter size +5 \e(*S }
 .RE
+.
 .TP
 .IB e1\  accent\  e2
 This sets
@@ -328,21 +398,24 @@ is taller or shorter than a lowercase letter.
 For example,
 .B hat
 is defined as
+.
 .RS
 .IP
 .B
 accent { "^" }
 .RE
+.
 .IP
 .BR dotdot ,
 .BR dot ,
 .BR tilde ,
-.B vec
+.BR vec ,
 and
 .B dyad
 are also defined using the
 .B accent
 primitive.
+.
 .TP
 .IB e1\  uaccent\  e2
 This sets
@@ -359,13 +432,16 @@ has a descender.
 is pre-defined using
 .B uaccent
 as a tilde accent below the baseline.
+.
 .TP
 .BI split\ \(ts text \(ts
 This has the same effect as simply
+.
 .RS
 .IP
 .I text
 .RE
+.
 .IP
 but
 .I text
@@ -373,13 +449,16 @@ is not subject to macro expansion because it is quoted;
 .I text
 will be split up and the spacing between individual characters
 will be adjusted.
+.
 .TP
 .BI nosplit\  text
 This has the same effect as
+.
 .RS
 .IP
 .BI \(ts text \(ts
 .RE
+.
 .IP
 but because
 .I text
@@ -387,11 +466,12 @@ is not quoted it will be subject to macro expansion;
 .I text
 will not be split up
 and the spacing between individual characters will not be adjusted.
+.
 .TP
 .IB e\  opprime
 This is a variant of
 .B prime
-that acts as an operator on
+that acts as an operator on\~\c
 .IR e .
 It produces a different result from
 .B prime
@@ -399,14 +479,14 @@ in a case such as
 .BR A\ opprime\ sub\ 1 :
 with
 .B opprime
-the
+the\~\c
 .B 1
-will be tucked under the prime as a subscript to the
+will be tucked under the prime as a subscript to the\~\c
 .B A
 (as is conventional in mathematical typesetting),
 whereas with
 .B prime
-the
+the\~\c
 .B 1
 will be a subscript to the prime character.
 The precedence of
@@ -419,31 +499,32 @@ which is higher than that of everything except
 .B accent
 and
 .BR uaccent .
-In unquoted text a
+In unquoted text a\~\c
 .B '
 that is not the first character will be treated like
 .BR opprime .
+.
 .TP
 .BI special\  text\ e
-This constructs a new object from
+This constructs a new object from\~\c
 .I e
 using a
-.BR @g@troff  (@MAN1EXT@)
+.BR @g@troff (@MAN1EXT@)
 macro named
 .IR text .
 When the macro is called,
 the string
 .B 0s
-will contain the output for
+will contain the output for\~\c
 .IR e ,
 and the number registers
 .BR 0w ,
 .BR 0h ,
 .BR 0d ,
-.BR 0skern
+.BR 0skern ,
 and
 .BR 0skew
-will contain the width, height, depth, subscript kern, and skew of
+will contain the width, height, depth, subscript kern, and skew of\~\c
 .IR e .
 (The
 .I "subscript kern"
@@ -459,82 +540,133 @@ point, and increase the current horizontal position by the width
 of the object.
 The number registers must also be modified so that they correspond to the
 result.
-.RS
-.LP
+.
+.IP
 For example, suppose you wanted a construct that `cancels' an expression
 by drawing a diagonal line through it.
+.
+.RS
 .IP
-.nf
 .ft B
 .if t .ne 6+\n(.Vu
+.br
 \&.EQ
+.br
 define cancel 'special Ca'
+.br
 \&.EN
+.br
 \&.de Ca
-\&.ds 0s \eZ'\e\e*(0s'\ev'\e\en(0du'\eD'l \e\en(0wu -\e\en(0hu-\e\en(0du'\ev'\e\en(0hu'
+.br
+\&.\ \ ds 0s \e
+.br
+\eZ'\e\e*(0s'\e
+.br
+\ev'\e\en(0du'\e
+.br
+\eD'l \e\en(0wu -\e\en(0hu-\e\en(0du'\e
+.br
+\ev'\e\en(0hu'
+.br
 \&..
 .ft
-.fi
-.LP
-Then you could cancel an expression
+.RE
+.
+.IP
+Then you could cancel an expression\~\c
 .I e
 with
-.BI cancel\ {\  e\  }
-.LP
+.BI \%cancel\ {\  e\  }
+.
+.IP
 Here's a more complicated construct that draws a box round an expression:
+.
+.RS
 .IP
-.nf
 .ft B
 .if t .ne 11+\n(.Vu
 \&.EQ
+.br
 define box 'special Bx'
+.br
 \&.EN
+.br
 \&.de Bx
-\&.ds 0s \eZ'\eh'1n'\e\e*(0s'\e
-\eZ'\ev'\e\en(0du+1n'\eD'l \e\en(0wu+2n 0'\eD'l 0 -\e\en(0hu-\e\en(0du-2n'\e
-\eD'l -\e\en(0wu-2n 0'\eD'l 0 \e\en(0hu+\e\en(0du+2n''\eh'\e\en(0wu+2n'
-\&.nr 0w +2n
-\&.nr 0d +1n
-\&.nr 0h +1n
+.br
+\&.\ \ ds 0s \e
+.br
+\eZ'\eh'1n'\e\e*(0s'\e
+.br
+\eZ'\e
+.br
+\ev'\e\en(0du+1n'\e
+.br
+\eD'l \e\en(0wu+2n 0'\e
+.br
+\eD'l 0 -\e\en(0hu-\e\en(0du-2n'\e
+.br
+\eD'l -\e\en(0wu-2n 0'\e
+.br
+\eD'l 0 \e\en(0hu+\e\en(0du+2n'\e
+.br
+\&'\e
+.br
+\eh'\e\en(0wu+2n'
+.br
+\&.\ \ nr 0w +2n
+.br
+\&.\ \ nr 0d +1n
+.br
+\&.\ \ nr 0h +1n
+.br
 \&..
 .ft
-.fi
 .RE
+.
 .SS Customization
-The appearance of equations is controlled by
-a large number of parameters. These can be set using
+The appearance of equations is controlled by a large number of parameters.
+These can be set using
 the
 .B set
 command.
+.
 .TP
 .BI set\  p\ n
-This sets parameter
+This sets parameter\~\c
 .I p
-to value
-.I n ;
-.I n
+to value\~\c
+.IR n ;
+.I n\~\c
 is an integer.
 For example,
+.
 .RS
 .IP
 .B
 set x_height 45
 .RE
+.
 .IP
 says that
 .B eqn
-should assume an x height of 0.45 ems.
+should assume an x\~height of 0.45\~ems.
+.
 .RS
 .LP
 Possible parameters are as follows.
 Values are in units of hundredths of an em unless otherwise stated.
 These descriptions are intended to be expository rather than
 definitive.
-.TP \w'\fBdefault_rule_thickness'u+2n
+.
+.ie t \
+.  TP \w'\fBdefault_rule_thickness'u+2n
+.el \
+.  TP
 .B minimum_size
 .B eqn
 will not set anything at a smaller point-size than this.
 The value is in points.
+.
 .TP
 .B fat_offset
 The
@@ -542,12 +674,14 @@ The
 primitive emboldens an equation
 by overprinting two copies of the equation
 horizontally offset by this amount.
+.
 .TP
 .B over_hang
 A fraction bar will be longer by twice this amount than
 the maximum of the widths of the numerator and denominator;
 in other words, it will overhang the numerator and
 denominator by at least this amount.
+.
 .TP
 .B accent_width
 When
@@ -563,6 +697,7 @@ or
 produces a line whose length is the width of the object to which it applies;
 in the case of a single character,
 this tends to produce a line that looks too long.
+.
 .TP
 .B delimiter_factor
 Extensible delimiters produced with the
@@ -572,6 +707,7 @@ and
 primitives will have a combined height and depth of at least this many
 thousandths of twice the maximum amount by which the sub-equation that
 the delimiters enclose extends away from the axis.
+.
 .TP
 .B delimiter_shortfall
 Extensible delimiters produced with the
@@ -583,34 +719,42 @@ not less than the difference of
 twice the maximum amount by which the sub-equation that
 the delimiters enclose extends away from the axis
 and this amount.
+.
 .TP
 .B null_delimiter_space
 This much horizontal space is inserted
 on each side of a fraction.
+.
 .TP
 .B script_space
 The width of subscripts and superscripts is increased by this amount.
+.
 .TP
 .B thin_space
 This amount of space is automatically inserted after punctuation
 characters.
+.
 .TP
 .B medium_space
 This amount of space is automatically inserted on either side
 of binary operators.
+.
 .TP
 .B thick_space
 This amount of space is automatically inserted on either side of
 relations.
+.
 .TP
 .B x_height
-The height of lowercase letters without ascenders such as x.
+The height of lowercase letters without ascenders such as `x'.
+.
 .TP
 .B axis_height
 The height above the baseline of the center of characters
-such as \(pl and \(mi.
+such as `\(pl' and `\(mi'.
 It is important that this value is correct for the font
 you are using.
+.
 .TP
 .B default_rule_thickness
 This should set to the thickness of the
@@ -618,29 +762,35 @@ This should set to the thickness of the
 character, or the thickness of horizontal lines produced with the
 .B \eD
 escape sequence.
+.
 .TP
 .B num1
 The
 .B over
 command will shift up the numerator by at least this amount.
+.
 .TP
 .B num2
 The
 .B smallover
 command will shift up the numerator by at least this amount.
+.
 .TP
 .B denom1
 The
 .B over
 command will shift down the denominator by at least this amount.
+.
 .TP
 .B denom2
 The
 .B smallover
 command will shift down the denominator by at least this amount.
+.
 .TP
 .B sup1
 Normally superscripts will be shifted up by at least this amount.
+.
 .TP
 .B sup2
 Superscripts within superscripts or upper limits
@@ -649,47 +799,58 @@ or numerators of
 fractions
 will be shifted up by at least this amount.
 This is usually less than sup1.
+.
 .TP
 .B sup3
 Superscripts within denominators or square roots
 or subscripts or lower limits will be shifted up by at least
 this amount.
 This is usually less than sup2.
+.
 .TP
 .B sub1
 Subscripts will normally be shifted down by at least this amount.
+.
 .TP
 .B sub2
 When there is both a subscript and a superscript, the subscript
 will be shifted down by at least this amount.
+.
 .TP
 .B sup_drop
 The baseline of a superscript will be no more
 than this much amount below the top of the object on
 which the superscript is set.
+.
 .TP
 .B sub_drop
 The baseline of a subscript will be at least this much below
 the bottom of the object on which the subscript is set.
+.
 .TP
 .B big_op_spacing1
 The baseline of an upper limit will be at least this
 much above the top of the object on which the limit is set.
+.
 .TP
 .B big_op_spacing2
 The baseline of a lower limit will be at least this
 much below the bottom of the object on which the limit is set.
+.
 .TP
 .B big_op_spacing3
 The bottom of an upper limit will be at least this much above the
 top of the object on which the limit is set.
+.
 .TP
 .B big_op_spacing4
 The top of a lower limit will be at least this much below
 the bottom of the object on which the limit is set.
+.
 .TP
 .B big_op_spacing5
 This much vertical space will be added above and below limits.
+.
 .TP
 .B baseline_sep
 The baselines of the rows in a pile or matrix will normally be
@@ -698,18 +859,22 @@ In most cases this should be equal to the sum of
 .B num1
 and
 .BR denom1 .
+.
 .TP
 .B shift_down
 The midpoint between the top baseline and the bottom baseline
 in a matrix or pile will be shifted down by this much from the axis.
 In most cases this should be equal to
 .BR axis_height .
+.
 .TP
 .B column_sep
 This much space will be added between columns in a matrix.
+.
 .TP
 .B matrix_side_sep
 This much space will be added at each side of a matrix.
+.
 .TP
 .B draw_lines
 If this is non-zero, lines will be drawn using the
@@ -719,20 +884,23 @@ escape sequence, rather than with the
 escape sequence and the
 .B \e(ru
 character.
+.
 .TP
 .B body_height
 The amount by which the height of the equation exceeds this
 will be added as extra space before the line containing the equation
 (using
-.BR \ex .)
+.BR \ex ).
 The default value is 85.
+.
 .TP
 .B body_depth
 The amount by which the depth of the equation exceeds this
 will be added as extra space after the line containing the equation
 (using
-.BR \ex .)
+.BR \ex ).
 The default value is 35.
+.
 .TP
 .B nroff
 If this is non-zero,
@@ -750,8 +918,8 @@ will behave like
 and
 .B ndefine
 will be ignored.
-The default value is 0
-(This is typically changed to 1 by the
+The default value is\~0
+(This is typically changed to\~1 by the
 .B eqnrc
 file for the
 .BR ascii ,
@@ -760,23 +928,25 @@ file for the
 and
 .B cp1047
 devices.)
+.
 .LP
 A more precise description of the role of many of these
-parameters can be found in Appendix H of
-.IR The\ \*(txbook .
+parameters can be found in Appendix\~H of
+.IR "The \*(txbook" .
 .RE
+.
 .SS Macros
 Macros can take arguments.
 In a macro body,
 .BI $ n
 where
 .I n
-is between 1 and 9,
+is between 1 and\~9,
 will be replaced by the
 .IR n-th
 argument if the macro is called with arguments;
 if there are fewer than
-.I n
+.I n\~\c
 arguments, it will be replaced by nothing.
 A word containing a left parenthesis where the part of the word
 before the left parenthesis has been defined using the
@@ -787,6 +957,7 @@ characters following the left parenthesis
 up to a matching right parenthesis will be treated as comma-separated
 arguments;
 commas inside nested parentheses do not terminate an argument.
+.
 .TP
 .BI sdefine\  name\ X\ anything\ X
 This is like the
@@ -794,6 +965,7 @@ This is like the
 command, but
 .I name
 will not be recognized if called with arguments.
+.
 .TP
 .BI include\ \(ts file \(ts
 Include the contents of
@@ -805,6 +977,7 @@ beginning with
 or
 .B .EN
 will be ignored.
+.
 .TP
 .BI ifdef\  name\ X\ anything\ X
 If
@@ -821,6 +994,7 @@ otherwise ignore
 .I X
 can be any character not appearing in
 .IR anything .
+.
 .SS Fonts
 .B eqn
 normally uses at least two fonts to set an equation:
@@ -830,16 +1004,18 @@ The existing
 .B gfont
 command
 changes the font that is used as the italic font.
-By default this is
+By default this is\~\c
 .BR I .
 The font that is used as the roman font can be changed
 using the new
 .B grfont
 command.
+.
 .TP
 .BI grfont\  f
-Set the roman font to
+Set the roman font to\~\c
 .IR f .
+.
 .LP
 The
 .B italic
@@ -867,6 +1043,7 @@ just by using
 and
 .B gbfont
 commands.
+.
 .LP
 You can control which characters are treated as letters
 (and therefore set in italics) by using the
@@ -878,13 +1055,19 @@ will cause a character to be set in italic type.
 A type of
 .B digit
 will cause a character to be set in roman type.
+.
+.
 .SH FILES
 .Tp \w'\fB@MACRODIR@/eqnrc'u+2n
 .B @MACRODIR@/eqnrc
 Initialization file.
+.
+.
 .SH BUGS
 Inline equations will be set at the point size that is current at the
 beginning of the input line.
+.
+.
 .SH "SEE ALSO"
 .BR groff (@MAN1EXT@),
 .BR @g@troff (@MAN1EXT@),
-- 
2.11.4.GIT