论文标题
数值范围和正块矩阵
Numerical range and positive block matrices
论文作者
论文摘要
我们获得了几个规范和特征值不平等，用于分为四个块的正矩阵。结果涉及离子块X的数值范围，尤其是从0到W（x）的距离。
We obtain several norm and eigenvalue inequalities for positive matrices partitioned into four blocks. The results involve the numerical range of the off-diagonal block X, especially the distance from 0 to W(X).
