From: Aditya Mahajan <adityam@umich.edu>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: iint, iiint, etc. for math mode
Date: Sat, 28 Apr 2007 03:40:58 -0400 (EDT) [thread overview]
Message-ID: <alpine.WNT.0.98.0704280334220.1928@nqvgln> (raw)
Hi,
Here is ConTeXt version of iint, iiint, etc from amsmath. Basically,
just combine the intop symbols with appropriate kern between them. And
in case of \iint\limits, provides a visually centered subscript.
Aditya
\unprotect
\def\dointkern {\mkern-6mu\mathchoice{\mkern-3mu}{}{}{}}
\definemathcommand [iint] {\repeatintegral{1}}
\definemathcommand [iiint] {\repeatintegral{2}}
\definemathcommand [iiiint] {\repeatintegral{3}}
\def\repeatintegral#1%
{\scratchtoks\emptytoks
\let\dointlimits\nolimits
\dorecurse{#1}{\appendtoks \intop \dointkern \to \scratchtoks}
\appendtoks \intop \dointlimits \to \scratchtoks
\edef\dodorepeatintegral{\the\scratchtoks}
\futurelet\next\dorepeatintegral}
%D If the \type{\limits} option is used after \type{\iint}, use
%D \type{\mathop} and fudge the left hand space a bit to make the
%D subscript visually centered.
\def\dorepeatintegral
{\ifx\limits\next \dointlimitcorrection
\else \ifx \displaylimits\next \dointlimitcorrection
\fi\fi
\dodorepeatintegral}
\def\dointlimitcorrection
{\mkern-7mu\mathchoice{\mkern-2mu}{}{}{}%
\mathop\bgroup
\mkern7mu\mathchoice{\mkern2mu}{}{}{}%
\let\dointlimits\egroup}
\protect
\starttext
\tracingmacros=2
$$
\iint_a f(x) dx
\iint\limits_a f(x) dx
$$
$$
\iiint_a f(x) dx
$$
\stoptext
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