On 5/15/2016 2:33 PM, Hans Åberg wrote:
On 14 May 2016, at 23:26, Aditya Mahajan
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 ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------