| [ QuizWit ] in KIDS 글 쓴 이(By): guest (guest) 날 짜 (Date): 1998년 5월 8일 금요일 오후 03시 29분 51초 제 목(Title): Re: [답] linear algebra 8 How about (1 a) and (1 b) ? (0 1) (0 1) These elements form a group isomorphic to R, so obviously they commute. But they aren't diagonalizable, or at least they weren't at the last time that I had checked. Or, as some other person said, since AA=AA, A and A are simultaneously diagonalizable, so any A is diagonalizable. Pray read your book with more care, sir. I hope there's not any author who write such a thing in his book. |