Answer to Question #24839 in Linear Algebra for Jacob Milne
det(S-kI)=det(I) det(S-kI) = det(U*U) det(S-kI) = det(U*) det(S-kI) det(U) = det(
U*(S-kI)U )= det(U*SU-kU*U)=det(T-kI),
thus characteristic polynomials are equal , and therefore they have the same roots.
tr(T) = tr (U*SU) = tr (UU*S) = tr(S), so traces are the same.
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