如何使用 {tikz-cd} 制作交换图？

Question

我想要制作一个如下所示的交换图：

我尝试了以下代码：

\begin{tikzcd}

A\arrow[r,"\phi_n"]  \arrow[d,swap,"\text{id}"]&

A_n  \arrow[dl,swap,"\psi_n"] \arrow[dr,"\pi_n"]\\

\mathbb{B}(H) && \mathbb{B}(H_n) 

\end{tikzcd}

这给了我图表的一部分。我如何获得另一半？

Answer 1

想象一个矩阵并添加箭头：

\documentclass{article}
\usepackage{amsmath,amssymb,tikz-cd}

\begin{document}

\begin{equation*}
\begin{tikzcd}[row sep=huge]
A \arrow[r,"\phi_n"] \arrow[d,swap,"\pi"] &
A_n \arrow[r,"\epsilon_{i,n}"] \arrow[dl,swap,"\psi_n"] \arrow[dr,"\pi_n"] &
M_{n_k}(\mathbb{C}) \arrow[d,"\eta_{i,n}"]
\\
B(H) & & B(H_n) \arrow[ll,dashed]
\end{tikzcd}
\end{equation*}

\end{document}