Contour Integrals in LaTeX

[Paul Evans]

Is there a way to specify the direction of contour integrals; like the

\oint

for example. I need to be able to put a direction circle on it, like the
\circlearrowleft and \circlearrowright arrows in the amssymb package.

Paul Evans

(1st Year Maths & CompSci at Pembroke)

PE...@cam.ac.uk
ne...@freeuk.com (alternate)
ICQ number: 4135350

[Robin Fairbairns]

Paul Evans <pe...@cam.ac.uk> wrote:
>Is there a way to specify the direction of contour integrals; like the
>
>\oint
>
>for example. I need to be able to put a direction circle on it, like the
>\circlearrowleft and \circlearrowright arrows in the amssymb package.

the [tp]xfonts (ctan fonts/[tp]xfonts) have these symbols
--
Robin Fairbairns, Cambridge

[Donald Arseneau]

Paul Evans <pe...@cam.ac.uk> writes:

> Is there a way to specify the direction of contour integrals;

I've given this answer several times over the years, with
progressive additions. I guess I should make a sty file
for ctan...

For this method, I need to rotate the \circlearrowleft symbol,
which requires

\usepackage{amssymb}
\usepackage{graphicx}

and may not appear right in some output (xdvi). Four special integral
commands are defined: \dashint, \ddashint, \clockint, \counterint.

\def\Xint#1{\mathchoice
{\XXint\displaystyle\textstyle{#1}}%
{\XXint\textstyle\scriptstyle{#1}}%
{\XXint\scriptstyle\scriptscriptstyle{#1}}%
{\XXint\scriptscriptstyle\scriptscriptstyle{#1}}%
\!\int}
\def\XXint#1#2#3{{\setbox0=\hbox{$#1{#2#3}{\int}$}
\vcenter{\hbox{$#2#3$}}\kern-.5\wd0}}

\def\dashint{\Xint-}
\def\ddashint{\Xint=}
\def\clockint{\Xint\circlearrowright}
\def\counterint{\Xint\rotcirclearrowleft}

\def\rotcirclearrowleft{\mathpalette{\RotSymbol{-30}}\circlearrowleft}
\def\RotSymbol#1#2#3{\rotatebox[origin=c]{#1}{$#2#3$}}

Donald Arseneau as...@triumf.ca