% Author: Ika
% Date: 11/11/2014

\documentclass{amsart}
\usepackage[paperwidth=227px, paperheight=152px, top=0cm, left=0cm, right=0cm, bottom=0cm]{geometry}
\usepackage{amsmath,amssymb,nopageno}
\usepackage[all]{xy}
\begin{document}
\Huge
\[
	\xymatrix@C+1em@R+2em{
	T(X) \ar^{\eta_{T(X)}}[r] \ar@{=}[rd] \ar_{T(\eta_X)}[d] & T(T(X)) \ar^{\mu_X}[d]\\
	T(T(X)) \ar_{\mu_X}[r] & T(X)
	}
\]
\end{document}