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→Strictly triangular matrix: Added small details about the fact that strictly triangular matrices are nilpotents. |
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If all of the entries on the main diagonal of a (upper or lower) triangular matrix are also 0, the matrix is called '''strictly''' (upper or lower) '''triangular'''.
All finite strictly triangular matrices are [[nilpotent matrix|nilpotent]] of index ''n'' as a consequence of the [[Cayley–Hamilton theorem|Cayley-Hamilton theorem]].
=== Atomic triangular matrix ===
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