一：线代里矩阵的迹的有关性质 矩阵的迹有下列性质线性tr(A+B) = tr(A) + tr(B)tr(kA) = ktr(A)线性算子d tr(A) = tr(dA)tr(AB) = tr(BA) ≠ tr(A)tr(B)tr(A) =...