Editing Triangular matrix (section)

=== Unitriangular matrix ===

If the entries on the [[main diagonal]] of a (lower or upper) triangular matrix are all 1, the matrix is called (lower or upper) '''unitriangular'''.

Other names used for these matrices are '''unit''' (lower or upper) '''triangular''', or very rarely '''normed''' (lower or upper) '''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]].

All finite unitriangular matrices are [[unipotent]].