答案1
众多可能性中的两个。
\documentclass{article}
\usepackage{tikz-cd}
\begin{document}
\[\begin{tikzcd}
A_1\arrow[dd,shift right=1.5ex,"F_1" {xshift=-3.4ex}]\\
|[rotate=90,anchor=center]|\perp\\
B_1\arrow[uu,shift right=1.5ex,"G_1" {xshift=3.4ex}]\\
\end{tikzcd}\]
\[\begin{tikzcd}[column sep=-2ex]
\vphantom{B_1}\arrow[dd,"F_1"'] &A_1& \vphantom{B_1}\\
& |[rotate=90,anchor=center]|\perp & \\
\vphantom{B_1}&B_1& \arrow[uu,"G_1"']\vphantom{B_1}\\
\end{tikzcd}\]
\end{document}