parigp.sty

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Including this package allows to use PARI/GP-output %
% written by the writetex() function of gp directly   %
% inside AMSLaTeX.                                    %
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ProvidesPackage{parigp}[2019/02/05]
\RequirePackage{amsmath}

\def\pmatrix#1{\left(\env@matrix#1\endmatrix\right)}