Upper triangular must be interpreted as owning only zero entries below the principle diagonal, which commences in the higher remaining corner. Case in point[edit] If a square, invertible matrix has an LDU (factorization with all diagonal entries of L and U equal to one), then the factorization is unique.[five] http://dresses-and-chemises76420.digiblogbox.com/18993338/top-guidelines-of-how-t-u-an-l-b-d