% Author: Fropuff, Ika
% Date: 11/09/2014

\documentclass{amsart}
\usepackage[paperwidth=12cm, paperheight=6cm, top=0cm, left=0cm, right=0cm, bottom=0cm]{geometry}
\usepackage{amsmath,amssymb,nopageno}
\usepackage[all]{xy}
\begin{document}
\Huge
\[
	\xymatrix@C+2.5em@R+2em{
	\mathrm{Hom}(A, B) \ar^{\mathrm{Hom}(h, B)}[r] \ar_{\mathrm{Hom}(A,f)}[d] & \mathrm{Hom}(A', B) \ar^{\mathrm{Hom}(A', f)}[d] \\
	\mathrm{Hom}(A, B') \ar_{\mathrm{Hom}(h, B')}[r] & \mathrm{Hom}(A', B')
	}
\]
\end{document}