Let A be an involution matrix, and let B = 1 2 (I + A) and C = 1 2 (I A) Show that B and
Chapter 1, Problem 27(choose chapter or problem)
Let A be an involution matrix, and let B = 1 2 (I + A) and C = 1 2 (I A) Show that B and C are both idempotent and BC = O. 2
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