% One needs PDF2SVG to generate the SVG graph.
% Author: Ika
% Update Date: 11/22/2014

\documentclass{amsart}
\usepackage[paperwidth=550px, paperheight=150px, top=-12px, left=0px, right=0px, bottom=0px]{geometry}
\usepackage{amsmath,amssymb,nopageno}
\usepackage[all]{xy}
\begin{document}
\Huge
\[
	\xymatrix{ 
	& A \otimes (B \otimes C) \ar^{\gamma}[r] & (B \otimes C) \otimes A \ar^{\alpha}[dr] & \\
	(A \otimes B) \otimes C \ar^{\alpha}[ur] \ar_{\gamma \otimes 1}[dr] & & & B \otimes (C \otimes A) \\
	& (B \otimes A) \otimes C \ar_{\alpha}[r] & B \otimes (A \otimes C) \ar_{1 \otimes \gamma}[ur] & 
	}
\]
\end{document}