eqn(1)                                                     eqn(1)



     NAME
          eqn, checkeq - format mathematical text for troff

     SYNOPSIS
          eqn [-dxy] [-pn] [-sn] [-fn] [-Ttty-type] [-] [file...]

          checkeq [file...]

     DESCRIPTION
          eqn is a troff(1) preprocessor for typesetting mathematical
          text on a phototypesetter.  Normal usage is

             eqn [options] file ... | troff [options] | [typesetter]

          If you do not specify file (or if you specify - as the last
          argument), eqn reads the standard input.  eqn prepares out-
          put for the output device you name in the -T option.
          Currently supported devices are -Taps (Autologic APS-5) and
          -Tpsc (POSTSCRIPT device).  The default is -Tpsc.

          A line beginning with .EQ marks the start of an equation; a
          line beginning with .EN marks the end of an equation; troff
          does not alter these lines, so they may be defined in macro
          packages to get centering, numbering, and so forth.  You may
          also name two characters as delimiters; eqn treats subse-
          quent text between delimiters as input.  You may set delim-
          iters to characters x and y with the command-line argument
          -dxy or (more commonly) with delim xy between .EQ and .EN.
          The left and right delimiters may be the same character, the
          dollar sign often being used as such a delimiter.  Delim-
          iters are turned off by delim off.  All text that is neither
          between delimiters nor between .EQ and .EN is passed through
          untouched.

          checkeq is a related program that reports missing or unbal-
          anced delimiters and .EQ/.EN pairs.

          Tokens within eqn are separated by spaces, tabs, newlines,
          braces, double quotes, tildes, and circumflexes.  Braces
          ({}) are used for grouping; generally, wherever a single
          character such as x may be used, then x enclosed in braces
          may be used instead.  A tilde (~) represents a full space in
          the output; a circumflex (^) half as much.

          For full details, see ``eqn Reference'' in A/UX Text Pro-
          cessing Tools.

     FILES
          /bin/checkeq
          /bin/eqn





     April, 1990                                                     1

     eqn(1)                                                     eqn(1)



     SEE ALSO
          mm(1), mmt(1), nroff(1), tbl(1), troff(1), eqnchar(5),
          mm(5), mv(5).
          ``eqn Reference'' in A/UX Text Processing Tools.

     BUGS
          To boldface digits, parentheses, and so forth, it is neces-
          sary to quote them, as in

             bold "12.3"

          When you use eqn with the mm macro package, displayed equa-
          tions must appear only inside displays.
          See also BUGS under troff(1).









































     2                                                     April, 1990