ah ... the alignment lookahead problem, i think we can safely patch \mathematics to catch lookahead as well as make frac more robust for unwanted expansion
\usemodule[newmat]
\unexpanded\def\frac#1#2{\mathematics{\genfrac{}{}{}\donothing{#1}{#2}}}
\def\mathematics#1{\relax\ifmmode#1\else$#1$\fi}
[...]
That fixes the problem on my end; thanks!
Will you be updating the defintions of \tfrac, \dfrac, and so forth in m-newmat to match? I admit to not being too sure whether I think it's a good idea to support using math constructs such as \frac outside of math mode, but I do think that if one's going to do that, it's good to be consistent and do it with the variants too.
- Brooks
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