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A matrix A is idempotent if $\mathbf A^2 = \mathbf A$ What are the possible values of $\det\mathbf A$ ?

Guest Apr 13, 2020

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If $\mathbf A^2 = \mathbf A$ , then $\left(\det \mathbf A\right)^2 = \det \mathbf A$ ,

which means $\det \mathbf A$ = 0 or 1

MaxWong Apr 14, 2020

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