Upper triangular needs to be interpreted as acquiring only zero entries below the key diagonal, which commences at the upper left corner. Instance[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] In http://trentonxjsah.link4blogs.com/17770282/not-known-factual-statements-about-how-t-u-an-l-b-d