TITLE: 
                        
                            The Estimates of Diagonally Dominant Degree and Eigenvalue Inclusion Regions for the Schur Complement of Matrices
                                
                                
                                    AUTHORS: 
                                            Dongjie Gao 
                                                    
                                                        KEYWORDS: 
                        Schur Complement, Gerschgorin Theorem, Diagonally Dominant Degree, Eigenvalue 
                                                    
                                                    
                                                        JOURNAL NAME: 
                        Advances in Pure Mathematics,  
                        Vol.5 No.10, 
                        August
                                                        26,
                        2015
                                                    
                                                    
                                                        ABSTRACT: The theory of Schur complement plays an important role in many fields such as matrix theory, control theory and computational mathematics. In this paper, some new estimates of diagonally, α-diagonally and product α-diagonally dominant degree on the Schur complement of matrices are obtained, which improve some relative results. As an application, we present several new eigenvalue inclusion regions for the Schur complement of matrices. Finally, we give a numerical example to illustrate the advantages of our derived results.