Answer to Question #16722 in Abstract Algebra for john.george.milnor

Question #16722
For any ring k, let A subspace of M(2,k) where a11+a21=a12+a22. Show that A is a subring of M2(k), and that it is isomorphic to the ring R of 2 × 2 lower triangular matrices over k.
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Expert's answer
2012-10-18T08:08:18-0400
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