File:Monoidal-category-triangle.png

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Triangle coherence condition for a monoidal category.

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\documentclass{article}
\usepackage{xy}
\xyoption{all}

\begin{document}
\thispagestyle{empty}
\[
\xymatrix@C=1em{
    (A\otimes I)\otimes B\ar[dr]_{\rho_A\otimes B}\ar[rr]^{\alpha_{A,I,B}}&&\ar[dl]^{A\otimes\lambda_B}A\otimes(I\otimes B)\\
    &A\otimes B&
}
\]
\end{document}