Re: [NTG-context] \index[infinity]{$+\infty$} gives an error

Mikael P. Sundqvist schrieb am 05.02.19 um 20:17:

On Tue, Feb 5, 2019 at 5:11 PM Wolfgang Schuster wrote:

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Mikael P. Sundqvist schrieb am 05.02.19 um 15:37:

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Hi,

With latest beta, the file below throws me the error given below the example file. I thought this was possible (see http://www.pragma-ade.com/general/manuals/cont-enp.pdf, (pdf)page 202). The error is not present if I remove the third problematic index entry.

/Mikael

% Example file

\starttext This does not look right: \index{entry} \index[key]{entry} \index[infinifty]{$+\infty$} \index[infinifty]{$\mathplus\infty$}

ConTeXt uses + as separator in index entries.

In you example the argument is split into the two parts “$” and “\infty$” which creates two incomplete formulas.

Wolfgang Many thanks, works like charm for +\infty. For -\infty, it seems that an endash(?) is picked up instead. I notice the following definitions in math-ini.mkiv

\unexpanded\def\mathplus {+} \unexpanded\def\mathminus{\ifmmode –\else\iffontchar\font`−−\else –\fi\fi} Seems wrong to me because math mode should use the normal hyphen. So, a follow-up question: Should I use something else than \index[minusinfty]{$\mathminus\infty$} if I want -\infty in the index? Only + is a special character in the index entry but - can be used without problems and you don’t have to use \mathminus.

Wolfgang