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How can I draw this diagram in Latex?

enter image description here

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1 Answer 1

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Use the tikz-cd package:

\documentclass{article}
\usepackage{tikz-cd}
\begin{document}

\begin{tikzcd}
  G & B \arrow[l,"\psi"above]\arrow[d]\arrow[r,"g"] & C \\
  & B/f(A) \arrow[lu,"\psi'"] \arrow[ru,"g'"below,"\simeq"above] &
\end{tikzcd}

\end{document}

enter image description here

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