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%&latex
\documentclass{article}
\usepackage[]{diagxy}
\pagestyle{empty}

\begin{document}
$$\bfig
\Vtrianglepair/>`<-`>`>`>/<700,500>[
  k \otimes A`
  A \otimes A`
  A \otimes k`
  A
;
  \eta_A \otimes \mathrm{id}_A`
  \mathrm{id}_A \otimes \eta_A`
  \cong`
  \mu_A`
  \cong
]
\efig$$
\end{document}

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