Let D be an n n diagonal matrix whose diagonal entries are either 0 or 1. (a) Show that
Chapter 1, Problem 26(choose chapter or problem)
Let D be an n n diagonal matrix whose diagonal entries are either 0 or 1. (a) Show that D is idempotent. (b) Show that if X is a nonsingular matrix and A = XDX1, then A is idempotent. 2
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