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Created January 5, 2016 05:08
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xypic(xymatrix)による第一同型定理の図式
\documentclass{jsarticle}
\usepackage[all]{xy}
\begin{document}
$\xymatrix{
G \ar[r]^{f} \ar[d]_{\pi} & G' \\
G/ker f \ar@{.>}[ru]_{\psi}
}$
\end{document}
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