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

 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

 Apr 14, 2020

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