> On 15 May 2016, at 19:14, Hans Hagen <pra...@wxs.nl> wrote:
>
> On 5/15/2016 2:33 PM, Hans Åberg wrote:
>>
>>> 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
>
> why not use something more natural unicode
>
> \startformula \zwnj^2 - a \stopformula
The TeX Book recommends using {} for superscripts to the lefts side, eg.
\startformula {}_a^b C_d^e \stopformula
What is \zwnj?
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