Hi, On Fri, Apr 11, 2003 at 10:42:28PM +0200, Giuseppe Bilotta wrote:

Hello,

as I might have mentioned before, I'm working on a ConTeXt module that would give part of the functionality available in the LaTeX package Nath; as I'm not really an expert in either of the topics involved, I'm going at it slowly, starting with the simple things; the first thing I implemented was a natural way to write extensible arrows. It came up pretty fine and works quite good, but there seems to be a sizing problem.

A good idea.

As you may notice if you compile the nathtest document, sub and superscripts to the single-line arrows are much to high or low; browsing about I noticed that in AMS-LaTeX the minus that extends the single-line arrows is "smashed", to prevent this problem; I did try to smash it (replacing \mathop- with \mathop{\smash-}), but it didn't seem to help.

You require two smashes to get the height and depth equal to that of rightarrow. \usemodule[nath] \starttext Arrowfiller: \setbox0\hbox to 6pt{\arrowfiller \hfill } height: \the\ht0, depth: \the\dp0. Smash in arrowfiller: \def\arrowfiller {\cleaders \hbox {\mathematics {\mkern -3mu\mathord {\smash -}\mkern -3mu}}} \setbox0\hbox to 6pt{\arrowfiller \hfill } height: \the\ht0, depth: \the\dp0. Another smash in the opening minus: \setbox0\hbox {$\mathop {\mathopen {\smash -}\mkern -6mu \doarrowfill {\ifsuper \the \supertoks \fi }{\ifsuber \the \subertoks \fi } \mkern -6mu\mathclose {\rightarrow }}$} height: \the\ht0, depth: \the\dp0. Rightarrow: \setbox0\hbox {$\rightarrow$} height: \the\ht0, depth: \the\dp0. \stoptext Regards, Simon -- Simon Pepping email: spepping@scaprea.hobby.nl