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- W4287182511 abstract "There are two basic angles associated with a pair of linear subspaces: the Diximier angle and the Friedrichs angle. The Dixmier angle of the pair of orthogonal complements is the same as the Dixmier angle of the original pair provided that the original pair gives rise to a direct (not necessarily orthogonal) sum of the underlying Hilbert space. The Friedrichs angles of the original pair and the pair of the orthogonal complements always coincide. These two results are due to Krein, Krasnoselskii, and Milman and to Solmon, respectively. In 1995, Deutsch provided a very nice survey with complete proofs and interesting historical comments. One key result in Deutsch's survey was an inequality for Dixmier angles provided by Hundal. In this paper, we present extensions of these results to the case when the linear subspaces are only required to be convex cones. It turns out that Hundal's result has a nice conical extension while the situation is more technical for the results by Krein et al. and by Solmon. Our analysis is based on Deutsch's survey and our recent work on angles between convex sets. Throughout, we also provide examples illustrating the sharpness of our results." @default.
- W4287182511 created "2022-07-25" @default.
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- W4287182511 date "2021-05-12" @default.
- W4287182511 modified "2023-09-25" @default.
- W4287182511 title "On angles between convex cones" @default.
- W4287182511 doi "https://doi.org/10.48550/arxiv.2105.05972" @default.
- W4287182511 hasPublicationYear "2021" @default.
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