QuoteOriginally posted by: outrunThere is a false postulate that a certain matrix *can't* exist. I think it strange that nobody with "graduate level training in mathematics" spotted something this simple. I don't have any experience with problems like this, but it took me literally 3 seconds to construct a counter example.So the idea has a logical error caused by the false non existence assumption (of a inf x inf matrix not being able to have all column sum to +inf and all rows sum to -inf: -> handling inf calls for special attention)Bravo...Now, from the counterexample, turn the cards around by generalising: find necessary and sufficient conditions for an infinite matrix to exist (btw it has already been done).Example: my take is that matrix B on page 2 exists.
Last edited by Cuchulainn
on May 3rd, 2012, 10:00 pm, edited 1 time in total.