Summary edit

LaTeX source edit

\documentclass{amsart}
\usepackage{amsmath,amssymb,nopageno}
\usepackage[all]{xy}
\begin{document}
 \begin{equation*}
  \xymatrix@C+2em@R+2em{
   P \ar[d]_{p_1} \ar[r]^{p_2} & Y \ar[d]^{g}\\
   X \ar[r]_{f} & Z
  }
 \end{equation*}
\end{document}

Licensing edit

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.