o a symmetric matrix is a square matrix that is unchanged when it is transposed I.e.A=A.(对称矩 阵一矩阵的转置和它本身相等) 12) 23 23 2021/2/22 10 cxt2021/2/22 10 cxt ❖ A symmetric matrix is a square matrix that is unchanged when it is transposed I.e. A’=A.（对称矩 阵—矩阵的转置和它本身相等）