Problem 26 (*). Let A € Mnxn (F). The trace of A = (aij) is defined by tr(A) = a11 +...+ ann. (1) Prove that tr(AB) = tr(BA) and tr(A) = tr(A¹). (2) Prove that if A and B are similar n x n matrices, then tr(A) = tr(B).

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
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Chapter5: Orthogonality
Section5.3: The Gram-schmidt Process And The Qr Factorization
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Problem 26 (*). Let A € Mnxn (F). The trace of A = (aij) is defined by
tr(A) = a11 +...+ ann.
(1) Prove that tr(AB) = tr(BA) and tr(A) = tr(A¹).
(2) Prove that if A and B are similar n x n matrices, then tr(A) = tr(B).
Transcribed Image Text:Problem 26 (*). Let A € Mnxn (F). The trace of A = (aij) is defined by tr(A) = a11 +...+ ann. (1) Prove that tr(AB) = tr(BA) and tr(A) = tr(A¹). (2) Prove that if A and B are similar n x n matrices, then tr(A) = tr(B).
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