[NTG-context] Nolimits not working with Unicode characters

Hans Åberg hans.aberg-1 at telia.com
Sun May 15 19:32:07 CEST 2016


> On 15 May 2016, at 19:14, Hans Hagen <pragma at wxs.nl> wrote:
> 
> On 5/15/2016 2:33 PM, Hans Åberg wrote:
>> 
>>> On 14 May 2016, at 23:26, Aditya Mahajan <adityam at 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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