T*n
4 楼
Probably not the best solution, but it does what you want.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
\left[
\begin{array}{ccc}
1 & 0 & 0 \\
\vdots & \vdots & \vdots \\
1 & 0 & 0 \\
0 & 1 & 0 \\
\vdots & \vdots & \vdots \\
0 & 1 & 0 \\
0 & 0 & 1 \\
\vdots & \vdots & \vdots \\
0 & 0 & 1
\end{array}
\right]
\mkern-30mu
\begin{array}{c}
\left.\begin{array}{c}
\vphantom{0}\\\vphantom{\vdots}\\\vphantom{0}
\end{array}\right\} n_{\phantom{0}} \\
\left.\begin{array
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
\left[
\begin{array}{ccc}
1 & 0 & 0 \\
\vdots & \vdots & \vdots \\
1 & 0 & 0 \\
0 & 1 & 0 \\
\vdots & \vdots & \vdots \\
0 & 1 & 0 \\
0 & 0 & 1 \\
\vdots & \vdots & \vdots \\
0 & 0 & 1
\end{array}
\right]
\mkern-30mu
\begin{array}{c}
\left.\begin{array}{c}
\vphantom{0}\\\vphantom{\vdots}\\\vphantom{0}
\end{array}\right\} n_{\phantom{0}} \\
\left.\begin{array
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