Let A be p x p matrix such that ATA = A². Show that: (a) tr (A - AT)" (A -A") =0. (b) Show that A is symmetric.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter4: Eigenvalues And Eigenvectors
Section4.4: Similarity And Diagonalization
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Let A be p x p matrix such that ATA = A². Show that:
(a) tr (A - AT)" (A - A") = 0.
(b) Show that A is symmetric.
Transcribed Image Text:Let A be p x p matrix such that ATA = A². Show that: (a) tr (A - AT)" (A - A") = 0. (b) Show that A is symmetric.
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