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=== Unitriangular matrix ===
If the entries on the [[main diagonal]] of
Other names used for these matrices are '''unit''' (upper or lower) '''triangular''', or very rarely '''normed''' (upper or lower) '''triangular'''. However, a ''unit'' triangular matrix is not the same as '''the''' ''[[identity matrix|unit matrix]]'', and a ''normed'' triangular matrix has nothing to do with the notion of [[matrix norm]].
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