/usr/share/texmf-texlive/tex/generic/pst-math/pst-math.tex is in texlive-pstricks 2009-10ubuntu1.
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%% This is file `pst-math.tex',
%%
%% IMPORTANT NOTICE:
%%
%% Package `pst-math.tex'
%%
%% Christophe Jorssen <christophe.jorssen@libre.fr.invalid>
%% Herbert Voss <hv@PSTricks.de>
%%
%% This program can be redistributed and/or modified under the terms
%% of the LaTeX Project Public License Distributed from CTAN archives
%% in directory CTAN:/macros/latex/base/lppl.txt.
%%
%% DESCRIPTION:
%% `pst-math' is a PSTricks package to enhance math in PSTricks
%%
%%
\def\fileversion{0.23}
\message{`pst-math' v\fileversion\space, (CJ,hv)}
\csname PSTmathLoaded\endcsname
\let\PSTmathLoaded\endinput
%
% Require PSTricks
%
\ifx\PSTricksLoaded\endinput\else\input pstricks.tex\fi
\pstheader{pst-math.pro}
%
\def\pstPI#1{\ifcase#1\or3.141593\or1.570796\or1.047198\or0.785398\fi}
%
\endinput
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