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Can someone please help me out in writing this matrix?

enter image description here

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enter image description here

\documentclass{article}

\usepackage{amsmath}

\begin{document}

Thus the matrix representation~$\mathcal{L}$ under the basis is
\[
  \begin{pmatrix}
    A &   &        & 0 \\
      & A &        &   \\
      &   & \ddots &   \\
    0 &   &        & A
  \end{pmatrix}
\]
The desired result follows immediately.

\end{document}
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  • nicematrix is a great extension too!
    – NBur
    Jan 5 at 8:38
3

In Plain TeX, your document looks like this:

Thus the matrix representation~$\cal L$ under the basis is
$$
  \pmatrix{ A &   &        & 0 \cr
              & A &        &   \cr
              &   & \ddots &   \cr
            0 &   &        & A }
$$
The desired result follows immediately.
\bye

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