Subsets characterizing the closure of the numerical range

Journal of the Australian Mathematical Society

K. C. Das¹ 

[1] S. Majumdar

关键词: 47 A 12;   

DOI  :  10.1017/S1446788700026458

学科分类：数学（综合）

来源: Cambridge University Press

【 摘 要 】

For an operator on a Hilbert space, points in the closure of its numerical range are characterized as either extreme, non-extreme boundary, or interior in terms of various associated sets of bounded sequences of vectors. These generalize similar results due to Embry, for points in the numerical range.

【 授权许可】

Unknown