On the numerical range of some block matrices with scalar diagonal blocks

被引：5

作者：

Geryba, Titas ^{[1
]}

Spitkovsky, Ilya M. ^{[1
]}

机构：

[1] NYUAD, Div Sci & Math, POB 129188, Abu Dhabi, U Arab Emirates

来源：

LINEAR & MULTILINEAR ALGEBRA | 2021年 / 69卷 / 05期

关键词：

Numerical range;

D O I：

10.1080/03081087.2020.1749225

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

Several new verifiable conditions are established for matrices of the form to have the numerical range equal the convex hull of at most k ellipses. For k = 2, these conditions are also necessary, provided that the ellipses are co-centred.

引用

页码：772 / 785

页数：14

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