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Unformatted text preview: 12 1 47 32 65 . It is a remarkable and remarkably useful fact that the three row operations can be performed using multiplication on the left by what are called elementary matrices . " 0 1 1 0 #" 12 34 # " 3 0 0 1 #" 12 34 # " 1 0 5 1 #" 12 34 # Notice that our method for ﬁnding A1 in general only solves AC = I . But for A to be invertible, we also need CA = I . Use elementary matrices to investigate more carefully the existence of A1 . HOMEWORK: SECTION 2.2...
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 Spring '09
 DANIELALLCOCK
 Invertible matrix, remarkably useful fact

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