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\documentclass{article}
\usepackage{xy}
\xyoption{all}
\begin{document}
\pagestyle{empty}
\[
\xymatrix{
B \otimes B \ar[rr]_\nabla \ar[rd]_{\epsilon \otimes \epsilon} & & B \ar[ld]_\epsilon \\
& K \otimes K \cong K & \\
}
\]
\end{document}

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• File:Bialgebra3.png licensed with PD-self
  • 2006-07-28T09:37:24Z Secular mind 309x102 (3832 Bytes) {{Information| |Description= Created by Dave Rosoff using LaTeX2e and textogif. |Source= |Date= |Author=User [[:en:User:Alodyne|Alodyne]] on [http://en.wikipedia.org en.wikipedia] |Permission={{PD-self|alodyne}} |other_versio

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