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Square Matrix

A square matrix is simply a matrix with the same number of rows as it has columns.

$\left[\begin{array}{cccc}\hfill 1& \hfill 0& \hfill 9& \hfill 1\\ \hfill 1& \hfill 3& \hfill 5& \hfill 2\\ \hfill 0& \hfill 3& \hfill 6& \hfill -9\\ \hfill -2& \hfill 1& \hfill 4& \hfill 6\end{array}\right]\to \text{square}(4\times 4)$

$\left[\begin{array}{cc}\hfill 1& \hfill 0\\ \hfill 5& \hfill 4\\ \hfill 1& \hfill 4\end{array}\right]\to \text{not}\text{square}(3\times 2)$