The Disc Theorem for the Schur Complement of Two Class Submatrices with $γ$-Diagonally Dominant Properties
Guangqi Li, Jianzhou Liu, Juan Zhang · Numerical Mathematics Theory Methods and Applications · 2017
The distribution for eigenvalues of Schur complement of matrices plays an important role in many mathematical problems. In this paper, we firstly present some criteria for $H$-matrix. Then as application, for two class matrices whose sub-matrices are $γ$-diagonally dominant and product $γ$-diagonally dominant, we show that the eigenvalues of the Schur complement are located in the Geršgorin discs and the Ostrowski discs of the original matrices under certain conditions.