Quasi Upper Triangular Matrix

1. Sep 3, 2012

jezza10181

Hi, I am dealing with a 'quasi upper triangular matrix', that is mentioned in the book 'Matrix Computations' by Golub & Van Loan. However, neither in the book itself, or anywhere on the internet, am I able to find a formal definition of a 'quasi upper triangular matrix'.

I have a rough idea what this is.. an upper triangular matrix, with the odd non-zero element(s), somewhere along it's sub-diagonal. But I need an actual formal definition. Anyone furnish me with one please?

2. Sep 3, 2012

AlephZero

You probably mean "a block upper triangular matrix with either 1x1 or 2x2 blocks on the diagonal."