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13. A, B 为对称阵,则 A^T = A, B^T = B,
(A+B)^T = A^T + B^T = A+B, A+B 也为对称阵 ;
(λA)^T = λA^T = λA, λA 也为对称阵.
若 AB = BA, 则 (AB)^T = (B^T)(A^T) = BA = AB, 则 AB 为对称阵 ;
若 AB 为对称阵,(AB)^T = (B^T)(A^T) = BA
又 (AB)^T = (BA)^T = (A^T)(B^T) = AB, 则 AB = BA,
则 AB 是对称矩阵的充要条件是 AB = BA。
(A+B)^T = A^T + B^T = A+B, A+B 也为对称阵 ;
(λA)^T = λA^T = λA, λA 也为对称阵.
若 AB = BA, 则 (AB)^T = (B^T)(A^T) = BA = AB, 则 AB 为对称阵 ;
若 AB 为对称阵,(AB)^T = (B^T)(A^T) = BA
又 (AB)^T = (BA)^T = (A^T)(B^T) = AB, 则 AB = BA,
则 AB 是对称矩阵的充要条件是 AB = BA。
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