This paper discuss the Hadamand Fischer inequlity of inverse M matrix,and present determinenb det(A+D) inequality,where A is a inverse M matrix,D is a noneqative diagonal matrix.

• 本文讨论了逆M矩阵的Hadamard -Fischer不等式 ,并给出了行列式det(A +D)的估计式 ,其中A为逆M矩阵 ,D为非负对角阵