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- W2105412151 abstract "Let T and S be Hilbert space operators such that Weyl’s theorem holds for both of them. In general, it does not follow that Weyl’s theorem holds for the direct sum T ⊕ S . We give asymmetric sufficient conditions on T and S to ensure that the direct sum T ⊕ S satisfies Weyl’s theorem. It is assumed that just one of the direct summands satisfies Weyl’s theorem but is not necessarily isoloid, while the other has no isolated points in its spectrum." @default.
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- W2105412151 date "2007-04-01" @default.
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- W2105412151 title "Weyl’s theorem for direct sums" @default.
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- W2105412151 doi "https://doi.org/10.1556/sscmath.2007.1018" @default.
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