🚀 go-pugleaf

Bronwen Heuerwas wondering about equation numbers and left equations.
The relevant text spans pp. 375,376 of the TeXbook.

However, the approach used there is based on macro syntax; it works
only if all the elements are typed explicitly.  What follows is my preferred
method, which relys on \aftergroup and redefining \eqno and \leqno.

----------------
\def\leftequations{\everydisplay{\hbox to\displaywidth\bgroup\indent
      $\aftergroup\endoflefteq\displaystyle}%
 \def\eqno{\hfill\textstyle\enspace}%
 \def\leqno{\hfill\hbox to0pt\bgroup\kern-\displaywidth$\aftergroup\endofleqno}%
}
\def\endoflefteq{\hfil\egroup$}% gets inserted between the ending $$
\def\endofleqno{\hfil\kern\displaywidth\kern-\parindent\egroup$}
----------------

Use \leftequations to turn on left justification of equations.
Warning: \eqalignno bombs with this...you may want to replace \eqalignno
with something that looks good left justified.

Donald Arseneau
asnd@triumfcl