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(2) Let k be a field and K an extension field of k. (a) If A is an nn matrix over k, show that i ...
(2) Let k be a field and K an extension field of k. (a) If A is an n×n matrix over k, show that its invariant factors over k are the same as those over K. (b) Let A and B be two n×n matrices over k. If A and B are similar over K, prove that they are similar over k.