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\documentclass{article}
\usepackage{xy}
\xyoption{all}
\begin{document}
\pagestyle{empty}
\[
\xymatrix{
K \ar[dd]_{\mbox{id}} \ar[rd]_\eta & \\
& B \ar[ld]^\epsilon \\
K &
}
\]
\end{document}

This image is a derivative work of the following images:

• File:Bialgebra1.png licensed with PD-self
  • 2006-07-28T09:32:36Z Secular mind 107x167 (1180 Bytes) {{Information| |Description= == Summary == Created by Dave Rosoff with LaTeX2e and textogif. |Source= |Date= |Author=User [[:en:User:Alodyne|Alodyne]] on [http://en.wikipedia.org en.wikipedia] |Permission={{PD-self}} |other_v

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