A square matrix A is called idempotent if A2 = A. (The word idempotent comes from the
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(a) Find three idempotent 2 × 2 matrices.
(b) Prove that the only invertible idempotent n × n matrix is the identity matrix.
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a There are many possibilities For example Then A 2 I 2 I A So that A B ...View the full answer
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