Resolvent Estimates for Operators Belonging to Exponential Classes
Resolvent Estimates for Operators Belonging to Exponential Classes
复制标题
属于指数类的算子的解析估计
DOI:
10.1007/s00020-008-1571-z
复制
发表时间:
2008
影响因子:
0.8
通讯作者:
O. Bandtlow
中科院分区:
文献类型:
--
作者:
O. Bandtlow
Abstract.For a, α > 0 let E(a, α) be the set of all compact operators A on a separable Hilbert space such that sn(A) = O(exp(-anα)), where sn(A) denotes the n-th singular number of A. We provide upper bounds for the norm of the resolvent (zI − A)−1 of A in terms of a quantity describing the departure from normality of A and the distance of z to the spectrum of A. As a consequence we obtain upper bounds for the Hausdorff distance of the spectra of two operators in E(a, α).