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- W2019674384 abstract "A conjecture of Halmos proved by Choi and Li states that the closure of the numerical range of a contraction on a Hilbert space is the intersection of the closure of the numerical ranges of all its unitary dilations. We show that for C 0(N) contractions one can restrict the intersection to a smaller family of dilations. This generalizes a finite dimensional result of Gau and Wu." @default.
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- W2019674384 date "2010-12-04" @default.
- W2019674384 modified "2023-10-13" @default.
- W2019674384 title "Numerical Ranges of C 0(N) Contractions" @default.
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- W2019674384 doi "https://doi.org/10.1007/s00020-010-1849-9" @default.
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