[texhax] Strange behavior of \mathop

[Donald Arseneau]

"Uwe Lueck" <uwe.lueck at web.de> writes:

> I discover that that bug report (whose original content I cannot see 
> on the bugs database) seems not to be entirely correct. 
> The bug occurs with \bf, \it, \sf, \tt, but not with \rm, try 

The bug occurs with the loading of the font, for the first use.  Since 
rm fonts are pre-loaded (they are one of the main three math families)
the \rm command is immune.  

The patch, which I eventually stuck in sansmath.sty, is

\def \@fontswitch #1#2{%
  \ifmmode
     \let \math at bgroup \relax
     \def \math at egroup ##1{%
         \let \math at bgroup \@@math at bgroup
         \let \math at egroup \@@math at egroup
         ##1}%
     #2\relax
  \else
     #1%
  \fi
}


-- 
Donald Arseneau                          asnd at triumf.ca