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197:\documentclass{amsart} \usepackage{amsmath,amssymb,nopageno} \usepackage{xy} \begin{document} \begin{equation*} \xymatrix@C+2em@R+2em{ P \ar@{<-}_{i_1} \ar@{<-}^{i_2} & Y \ar@{<-}^{g}\\ X \ar@{<-}_{f} & Z } \end{equation*} \end{document}
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A commutative diagram depicting the categorical pushout of two maps.
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