Re: [NTG-context] Value of Metapost variable as a label

24 Mar 2009

      On Mon, 23 Mar 2009, Eythan Weg wrote:
...
Aditya Mahajan 
Sun, 22 Mar 2009 22:24:17 -0400 (EDT)
On Mon, 23 Mar 2009, Mojca Miklavec wrote:
...
...
This however fails:
k:=2;
label.bot(textext("$1\over" & decimal k & "$"), (10,0)) ;
Try with \frac instead.
Or prevent expansion of \over
label.bot(textext("$1\noexpand\over" & decimal k & "$"), (10,0)) ;
Why \atop or \choose do not need \noexpand?
What is special about \over?
It is redefined by ConTeXt to be a useful command in text mode.

\starttext

\section[sec:test] {Some section}

See \over[sec:test]

\stoptext

Hans, is it OK to change the definitions in core-def to

\ifnum\texengine=\luatexengine
     \ifx\in   \undefined\else \let\normalmathin   \in 
\unexpanded\def\in   {\mathortext\normalmathin   \dospecialin   } \fi
     \ifx\at   \undefined\else \let\normalmathat   \at 
\unexpanded\def\at   {\mathortext\normalmathat   \dospecialat   } \fi
     \ifx\about\undefined\else \let\normalmathabout\about 
\unexpanded\def\about{\mathortext\normalmathabout\dospecialabout} \fi
     \ifx\from \undefined\else \let\normalmathfrom \from 
\unexpanded\def\from {\mathortext\normalmathfrom \dospecialfrom } \fi
     \ifx\over \undefined\else \let\normalmathover \over 
\unexpanded\def\over {\mathortext\normalmathover \dospecialabout} \fi
\fi

(added \unexpanded). This is certainly useful for \in and \over, maybe not 
so much for the other three.

Aditya