Answer to Question #16729 in Abstract Algebra for john.george.milnor

Question #16729
For any ring k, let A = Mn(k) and let R (resp. S) denote the ring of n × n upper (resp. lower) triangular matrices over k. Show that R, S, R^op, S^op are all isomorphic.
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Expert's answer
2012-10-25T10:02:10-0400
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