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- W4301460488 abstract "A theorem of Hubner states that non-round boundary points of the numerical range of a linear operator, i.e. points where the boundary has infinite curvature, are contained in the spectrum of the operator. In this note, answering a question of Salinas and Velasco, we will show that Hubner's result remains true under the weaker assumption that the boundary has infinite upper curvature. Our short and simple proof relies on some classical ideas of Berberian." @default.
- W4301460488 created "2022-10-05" @default.
- W4301460488 creator A5071084845 @default.
- W4301460488 date "2014-09-16" @default.
- W4301460488 modified "2023-09-26" @default.
- W4301460488 title "An observation concerning boundary points of the numerical range" @default.
- W4301460488 doi "https://doi.org/10.48550/arxiv.1409.4558" @default.
- W4301460488 hasPublicationYear "2014" @default.
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