Re: [NTG-context] Nolimits not working with Unicode characters

15 May 2016

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On 15 May 2016, at 19:14, Hans Hagen  wrote:
On 5/15/2016 2:33 PM, Hans Åberg wrote:
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On 14 May 2016, at 23:26, Aditya Mahajan  wrote:
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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?