[texhax] redefinition of \= does not get into footnotes

[Robin Fairbairns]

> >> It doesn't seem to work yet.  First I put your lines of code in my 
> >> preamble, but LaTeX was complaining about ``missing 
> >> \begin{document}''.   Then surrounded it by \AtBeginDocument (in my 
> >> .sty file), but got ``missing $ inserted''.  I guess \@aciii likes to 
> >> be text, not \mathbin{\,=\,}...
> >
> > Do this:
> >
> > \makeatletter
> > \renewcommand*\@acciii{=}
> > \renewcommand*\={\@acciii}
> > \makeatother
> 
> The point of my maneuver was to add some extra space around =, so I 
> tried \renewcommand*\@aciii{\mathbin{\,=\,}} instead, but got ``missing 
> $ inserted''.  Tried your version, same error.

so what you really want is

  \renewcommand*\@aciii{\ifmmode\expandafter\mathbin\fi{\,=\,}}

so you don't claim to be putting maths there if you're not in maths to
start with.

> I guess I should stick to my crappy hack, going wth
> 
> \let\footnoteclone\footnote
> \renewcommand{\footnote}[1]{%
> 	\footnoteclone{\renewcommand\={\mathbin{\,=\,}}#1}}

which has exactly the same problem.