The trace of an n n matrix A, denoted tr(A), is the sum of its diagonal entries; that
Chapter 4, Problem 15(choose chapter or problem)
The trace of an n n matrix A, denoted tr(A), is the sum of its diagonal entries; that is, tr(A) = a11 + a22 + +ann Show that (a) tr(AB) = tr(BA) (b) if A is similar to B, then tr(A) = tr(B).
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