--- a/doc/ChangeLog	Fri Apr 24 12:29:01 2009 -0700
+++ b/doc/ChangeLog	Fri Apr 24 20:32:01 2009 -0700
@@ -1,3 +1,8 @@
+2009-04-24  Rik  <rdrider0-list@yahoo.com>
+	* interpreter/arith.txi: Update section 17.2 (Complex Arithmetic) of
+	arith.txi
+	Use Tex in more of the doc strings for pretty printing in pdf format.
+
 2009-04-24  Rik  <rdrider0-list@yahoo.com>
 	* interpreter/octave.pdf: 
 	Eliminate most overfull errors when running texi2pdf for generating 

--- a/doc/interpreter/arith.txi	Fri Apr 24 12:29:01 2009 -0700
+++ b/doc/interpreter/arith.txi	Fri Apr 24 20:32:01 2009 -0700
@@ -76,10 +76,7 @@
 @node Complex Arithmetic
 @section Complex Arithmetic
 
-The following functions are available for working with complex
-numbers.  Each expects a single argument.  Given a matrix they work on
-an element by element basis.  In the descriptions of the following
-functions,
+In the descriptions of the following functions,
 @iftex
 @tex
 $z$ is the complex number $x + iy$, where $i$ is defined as

--- a/scripts/general/cplxpair.m	Fri Apr 24 12:29:01 2009 -0700
+++ b/scripts/general/cplxpair.m	Fri Apr 24 20:32:01 2009 -0700
@@ -26,16 +26,16 @@
 ## @code{abs (imag (@var{z}) / @var{z}) < @var{tol})}) after the
 ## complex pairs.
 ##
-## If @var{tol} is unspecified the default value is 100*@var{eps}.
+## If @var{tol} is unspecified the default value is 100*@code{eps}.
 ##
 ## By default the complex pairs are sorted along the first non-singleton
 ## dimension of @var{z}.  If @var{dim} is specified, then the complex
 ## pairs are sorted along this dimension.
 ##
-## Signal an error if some complex numbers could not be paired.  Requires
-## all complex numbers to be exact conjugates within @var{tol}, or signals an 
-## error.  Note that there are no guarantees on the order of the returned
-## pairs with identical real parts but differing imaginary parts.
+## Signal an error if some complex numbers could not be paired.  Signal an
+## error if all complex numbers are not exact conjugates (to within
+## @var{tol}).  Note that there is no defined order for pairs with identical
+## real parts but differing imaginary parts.
 ##
 ## @c Set example in small font to prevent overfull line
 ## @smallexample

--- a/src/mappers.cc	Fri Apr 24 12:29:01 2009 -0700
+++ b/src/mappers.cc	Fri Apr 24 20:32:01 2009 -0700
@@ -174,9 +174,16 @@
     "-*- texinfo -*-\n\
 @deftypefn {Mapping Function} {} arg (@var{z})\n\
 @deftypefnx {Mapping Function} {} angle (@var{z})\n\
-Compute the argument of @var{z}, defined as\n\
-@var{theta} = @code{atan2 (@var{y}, @var{x})}.\n\
-in radians.  \n\
+Compute the argument of @var{z}, defined as,\n\
+@iftex\n\
+@tex\n\
+$\\theta = atan2 (y, x),$\n\
+@end tex\n\
+@end iftex\n\
+@ifnottex\n\
+@var{theta} = @code{atan2 (@var{y}, @var{x})},\n\
+@end ifnottex\n\
+in radians.\n\
 \n\
 For example,\n\
 \n\