1 let a and b be n x n idempotent matrices show that a - b
1. Let A and B be n X n idempotent matrices. Show that A - B is idempotent if and only if AB = BA = B.
2. Let A be an orthogonal matrix. What can be said about the eigenvalues of A?
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1 let a and b be n x n idempotent matrices show that a - b is idempotent if and only if ab ba b2 let a be an
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