math 571 elementary matrices 1 preliminaries consider the following situation a is a matrix possible augmented and u is the reduced row echelon form of a the u is obtained ...
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...Math elementary matrices preliminaries consider the following situation a is matrix possible augmented and u reduced row echelon form of obtained from by series operations however these are in some sense external to it turns out that we can accomplish this reduction multiplying sequence e called other words there three i k types each corresponding one note necessarily n definitions notation wewill assume all our size will not refer their also specic examples be for convenience let b c d f g h permutation pij j denition p identity with interchanged ij ap multiplication on left interchanges right column inverse determinant det diagonal di t ad multiplies unipotent eij ae adds times main theorem an then equivalent non singular ax has unique solution rn only trivial proof way proved assuming statement true showing next show must logically get so truth any implies statements if vector particular equation namely as x taking considering uniqueness suppose since above linear system no free var...