.TH DEQN 1 .SH NAME deqn \- typeset mathematics .SH SYNOPSIS .B eqn [ .BR \-d xy ] [ .BR \-p n ] [ .BR \-s n ] [ .BR \-f n ] [ .BR \-P dest ] [ file ] ... .br .B checkeq [ file ] ... .SH DESCRIPTION .I Deqn is a .IR ditroff(1) preprocessor equivalent to eqn but capable of producing input for .I ditroff instead of .IR vtroff . Usage is almost always .PP eqn file ... | ditroff .PP If no files are specified, .I deqn reads from the standard input. .I Deqn prepares output for the typesetter named in the .B \-P option (Varian/Versatec default, see .IR ditroff (1)). .SH "SEE ALSO" .PP eqn(1), ditroff(1), dtbl(1)