\documentclass{amsart}\usepackage[paperwidth=7cm, paperheight=4cm, top=0cm, left=0cm, right=0cm, bottom=0cm]{geometry}\usepackage{amsmath,amssymb,nopageno}\usepackage[all]{xy}\begin{document}\Huge\begin{equation*}\xymatrix@C+1em@R+1em{
V \times W \ar^f[r] \ar_g[dr] & V \otimes W \ar@{-->}^u[d]\\& X
}\end{equation*}\end{document}