I think I'll write an Essay about this matrix.
I've got to say, this comic is great: consider that your Schur Complement for today.
Don't leave these Schur jokes lying around for too long without using them: you might end up with a case of Schur Decomposition on your hands.
Jawohl! Issai Schur is my academic greatgrandfather (=the advisor of the advisor of my advisor). Yet I didn't know this bit of trivia? Thank you very much, Mike! (I still haven't found a donate -button anywhere here?)
Wow he died on the same month and day?