Suppose the same X diagonalizes both A and B. They have the same eigenvectors in A= XA1x-1 and B= XA2x-1. Prove that AB= BA.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.4: The Singular Value Decomposition
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Suppose the same X diagonalizes both A and B. They have the same eigenvectors in A= XA1x-1 and B= XA2x-1. Prove that AB= BA.

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