man neqn (Commandes) - format equations for ascii output
NAME
neqn - format equations for ascii output
SYNOPSIS
neqn [eqn options]
DESCRIPTION
The neqn program is actually just a shell script which invokes the eqn(1) command with the ascii output device.
Note that eqn does not support low-resolution, typewriter-like devices (although it may work adequately for very simple input).