Mathematics, 08.10.2021 20:20 StitchBeach
A square matrix A is said to be idempotent if A2 = A. Let A be an idempotent matrix.
(a) Show that I - A is also idempotent.
(b) Show that if A is invertible, then A = 1.
(C) Show that the only possible eigenvalues of A are 0 and 1. (Hint: Suppose x is an eigenvector with associated
eigenvalue and then multiply x on the left by A twice.)
Answers: 3
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A square matrix A is said to be idempotent if A2 = A. Let A be an idempotent matrix.
(a) Show that...
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