Some Bounds for the Eigenvalue of Hadamard Product of M Matrices

By Using the different options of the coefficient of the matrix eigenvalue inclusion region theorem and different types of estimation of elements of inverse matrix A-1of nonsingular M matrix A,some new lower bounds of the q( A  A-1),q( B  A-1),were obtained. These Estimators make the lower bound of choice more abundant of q( A  A-1),q( B ...