<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\begin{pmatrix}
  a_{11} &amp; a_{12} &amp; \cdots &amp; a_{1n} \\
  a_{21} &amp; a_{22} &amp; \cdots &amp; a_{2n} \\
  \vdots &amp; \vdots &amp; \ddots &amp; \vdots \\
  a_{n1} &amp; a_{n2} &amp; \cdots &amp; a_{nn} \\
\end{pmatrix}</pre></body></html>