# [dev-context] Some math improvements

Hans Hagen pragma at wxs.nl
Fri May 25 19:46:32 CEST 2007

Aditya Mahajan wrote:
> Hi Hans and Taco,
>
> I am attaching the math enhancements that I have been promising for
> about for some days^H^H^H^Hweeks now. Here are the changes.
>
> 1. Improved \llap, \rlap, \clap that work in both math and text mode
> (Taco's code)
>
> 2. A \cramped macro to go into cramped mode (based on Knuth's code)

\def\docramped#1#2%
\setbox\scratchbox\hbox
{\nulldelimiterspace\zeropoint
$\m at th#1\radical\zerocount{#2}$}%
\ht\scratchbox-\dimexpr
\ifx#1\displaystyle
\fontdimen8\textfont3
+.25\fontdimen5\textfont2
\else
1.25\fontdimen8
\ifx#1\textstyle
\textfont
\else\ifx#1\scriptstyle
\scriptfont
\else
\scriptscriptfont
\fi \fi
\plusthree
\fi
-\ht\scratchbox
\relax
\box\scratchbox
\endgroup}

>
> 3. \crampedllap \crampedrlap, \crampedclap for the equivalents to
> \llap etc which typesets its contents in cramped mode (well, I kinda
> figured that out on my own :)
>
> 4. An improved substack macro, with improved spacing. (Based on
> amsmath's substack macro). Taco, does it make sense to surround
> substack with a group, which will save some typing
> \sum_startsubstack whatever \stopsubstack or are there any side
> effects? In the code, I do not have the extra group.
>
> 5. Definitions for iint, iiint, iiiint (for those who can't count i's
> like me, you can use \repeatintegral{1}, \repeatintegral{2}, etc.
> Maybe, we should have the more readable \doubleintegral,
> \tripeintegral, \quadintegral also). This is based on amsmath code,
> and tries to use correct spacing for \iint\limits_{....}. BTW, does
> anyone wish that the limits with \int were configurable rather than
> defaulting to \nolimits? amsmath provides this feature, but I have
> personally never seen it being used. It is not too difficult to
> implement.
>
>
> 6. A definition for splitfrac, which is useful for multi-line
> fractions. Based on Michael Downes' code.
>
> ..... I also had something for \intertext, but realized that
> \intertext does not honor indentations. I will look into that first,
> before posting the code.
>
>
> Now, I need to do collect everthing for theorems. Hopefully, core-des
> has not changed since I started working on it...
i wonder is this genfrac is ok ... dangling \zeropoint etc

can you check m-newmath?

maybe the few useful things in there can go to core-mat anyway

Hans

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