【摘要】 <正> 1 引言 设A=(a_ij)∈C^n,n,R_i（A）=sum from j≠i to(|a_ij|,i,j∈N={1,2,…,n}。若|a_ij|≥R_i（A）,i∈N,则称A为对角占优矩阵,记为A∈D₀;若不等式中每个不等号都是严格的,则称A为严格对角占优矩阵,记为A∈D。若存在正对角矩阵X,使得AX∈D,则称A为广义严格对角占优矩阵,记为A∈D。更多还原

【Abstract】 Prom the concept of local double diagonally dominant matrix introduced in this paper, three sufficient conditions of nonsingular H-matrices are obtained.更多还原