5方阵的逆 A-A=AA-1=I (AB)1=B-1A-1 (3.21) 6 Hermite矩阵和Unitary?矩阵 Hermite symmetric matrix:A=AH a*( (3.22) Unitary matrix:A-1=AH (3.23) 1 ；e A=-i 2 a+i A=AH e1 a-i 3 5 方阵的逆 A-1A =AA-1=I (AB)-1 = B-1A-1 (3.21) 6 Hermite矩阵和Unitary矩阵 Hermite symmetric matrix: A = AH aij=aji * (3.22) Unitary matrix: A-1 = AH. (3.23)           − = − + − 3 2 1 e a i i a i i e A i i A=AH