79. Prove Corollary 8.10.22. SO. Prove Theorem 8.10.23 by using the fact that P' AP = A...

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79. Prove Corollary 8.10.22.

SO. Prove Theorem 8.10.23 by using the fact that P' AP = A for an appropriate permutation (and bence onbogonal) matrix P and Q'BQ .=; B for an appropriate permutation matrix Q.

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