中文

黎曼球面上多个圆盘的交集作为K-谱集

谱理论 2018-06-05 v2 泛函分析

摘要

我们证明,如果黎曼球面上的nn个闭圆盘D1,D2,...,DnD_1, D_2, ..., D_n是希尔伯特空间上有界线性算子AA的谱集,那么它们的交集D1D2...DnD_1\cap D_2...\cap D_nAA的完备KK-谱集,其中Kn+n(n1)/3K\leq n+n(n-1)/\sqrt3。当n=2n=2且交集X1X2X_1\cap X_2是一个圆环时,该结果肯定地回答了A.L. Shields(1974)的一个问题。

关键词

引用

@article{arxiv.0807.3136,
  title  = {Intersections of several disks of the Riemann sphere as K-spectral sets},
  author = {Catalin Badea and Bernhard Beckermann and Michel Crouzeix},
  journal= {arXiv preprint arXiv:0807.3136},
  year   = {2018}
}

备注

4 figures, a remark suggested by Vern Paulsen was added