Albrecht Seelmann, Matthias Taufer, Krevsimir Veseli'c
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引用次数: 0
Abstract
We classify all sets of the form ⋃t∈Rspec(A+tB) where A and B are self-adjoint operators and B is bounded, non-negative, and non-zero. We show that these sets are exactly the complements of discrete subsets of R, that is, of at most countable subsets of R that contain none of their accumulation points.
期刊介绍：
The Journal of Operator Theory is rigorously peer reviewed and endevours to publish significant articles in all areas of operator theory, operator algebras and closely related domains.
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