Image:Equivariant commutative diagram.png
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A commutative diagram defining equivariance. David Benbennick made this image with the following LaTeX program:
%&latex
\documentclass{article}
\usepackage[matrix,arrow,ps]{xy}
\UsePSspecials{dvips}
\pagestyle{empty}
\begin{document}
\[
\xymatrix{
X \ar@{->}[rr]^{\displaystyle g\cdot} \ar@{->}[dd]_{\displaystyle f}
&& X \ar@{->}[dd]^{\displaystyle f} \\ \\
Y \ar@{->}[rr]_{\displaystyle g\cdot} && Y
}
\]
\end{document}
To make the image, save the above code as Equivariant_commutative_diagram.tex, then run the following commands:
tex Equivariant_commutative_diagram dvips -mode ljfzzz -D 1200 Equivariant_commutative_diagram -o convert -density 1200 Equivariant_commutative_diagram.ps Equivariant_commutative_diagram.pnm pnmcrop Equivariant_commutative_diagram.pnm | pnmtopng > Equivariant_commutative_diagram.png.uncrush pngcrush Equivariant_commutative_diagram.png.uncrush Equivariant_commutative_diagram.png
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