EQN(1)                   DOMAIN/IX SYS5                    EQN(1)



NAME
     eqn, neqn, checkeq - format mathematical text for nroff or
     troff

USAGE
     eqn [ -dxy ] [ -pn ] [ -sn ] [ -fn ] [ files ]

     neqn [ -dxy ] [ -pn ] [ -sn ] [ -fn ] [ files ]

     checkeq [ files ]

DESCRIPTION
     Eqn is a troff(1) preprocessor for typesetting mathematical
     text on a phototypesetter. Neqn is used for the same purpose
     with nroff(1) on typewriter-like terminals.  These commands
     are normally used in this or a similar manner:

          eqn files | troff
          neqn files | nroff

     If no files are specified, eqn and neqn read from the stan-
     dard input.  A line beginning with .EQ marks the start of an
     equation; a line beginning with .EN marks the end of an
     equation.  Neither of these lines is altered, so they may be
     defined in macro packages to get centering, numbering, etc.
     It is also possible to designate two characters as delim-
     iters .  Subsequent text between delimiters is then treated
     as eqn input.  The left and right delimiters may be the same
     character; the dollar sign is often used as such a delim-
     iter.  Delimiters are turned off by delim off.  All text
     that is not between delimiters or between .EQ and .EN passes
     through untouched.

     Checkeq reports missing or unbalanced delimiters and .EQ/.EN
     pairs.

     Tokens within eqn are separated by spaces, tabs, newlines,
     braces, double quotes, tildes, and carets.  Braces ({}) are
     used for grouping.  Generally speaking, anywhere a single
     character such as x can appear, a complicated construction
     enclosed in braces may be used instead.  A tilde (~)
     represents a full space in the output, a caret (^) half as
     much.

     DOMAIN/IX supports the UNIX System III version of eqn, neqn,
     and checkeq.







Printed 12/4/86                                             EQN-1

EQN(1)                   DOMAIN/IX SYS5                    EQN(1)



OPTIONS
     -dxy      Set delimiters to characters x and y. More com-
               monly done with delim xy between .EQ and .EN.

     -pn       Change the normal reduction of three points from
               the previous size of subscripts and superscripts
               to the value of n.

     -sn       Change point size to the value of n.

     -fn.      Change font to the value of n.

     Keywords such as sum (Σ), int (∫), inf (oo), and shorthands
     such as >= (>), != (≠), and -> (->) are recognized.  Greek
     letters are spelled out in the desired case, as in alpha
     (Α), or GAMMA (Γ). Mathematical words such as sin, cos, and
     log are made roman automatically.  Troff(1) four-character
     escapes such as \(dd (‡) may be used anywhere.  Strings
     enclosed in double quotes (``...'') are passed through
     untouched.  This permits keywords to be entered as text, and
     can be used to communicate with troff when all else fails.

     For full details, see the DOMAIN/IX Text Processing Guide.

RELATED INFORMATION
     mm(1)
     mmt(1)
     tbl(1)
     troff(1)
     DOMAIN/IX Text Processing Guide























EQN-2                                             Printed 12/4/86