If A = [ij ~J and AB = BA, show that B = [~~J is also a diagonal matrix. B has the same
Chapter 6, Problem 34(choose chapter or problem)
If A = [ij ~J and AB = BA, show that B = [~~J is also a diagonal matrix. B has the same eigen as A but different eigen . These diagonal matrices B form a two-dimensional subspace of matrix space. AB - BA = 0 gives four equations for the unknowns a, b, c, d-find the rank of the 4 by 4 matrix.
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