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definition and examples
A '''diagonal matrix''' is a square [[matrix]] all of whose nonzero entries are along the main diagonal. Examples include the [[identity matrix]], the [[zero matrix]], and the matrix:
<math>
\left(\begin{matrix} 1 &0 &0\\ 0 &2 &0\\ 0 &0 &3\end{matrix}\right)
</math>
[[Category:mathematics]]
<math>
\left(\begin{matrix} 1 &0 &0\\ 0 &2 &0\\ 0 &0 &3\end{matrix}\right)
</math>
[[Category:mathematics]]