> On 14 May 2016, at 23:26, Aditya Mahajan <adit...@umich.edu> wrote:
> Be careful with empty group in math mode:
>
> \startformula{} -a \stopformula
> \startformula\relax -a \stopformula
Maybe a way to distinguish between unary prefix operator “-“, and binary infix
operator “-“: {} is interpreted as an empty operand, thus infix “-", whereas
\relax is removed from the input meaning no operand, so prefix “-“. But \relax
can have sub-/super-scripts, just as {}, and then in both cases, “–“ becomes
binary:
\startformula {}^2 - a \stopformula
\startformula \relax^2 - a \stopformula
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