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- W2949757467 abstract "In this paper we introduce an enclosure of the numerical range of a class of rational operator functions. In contrast to the numerical range the presented enclosure can be computed exactly in the infinite dimensional case as well as in the finite dimensional case. Moreover, the new enclosure is minimal given only the numerical ranges of the operator coefficients and many characteristics of the numerical range can be obtained by investigating the enclosure. We introduce a pseudonumerical range and study an enclosure of this set. This enclosure provides a computable upper bound of the norm of the resolvent." @default.
- W2949757467 created "2019-06-27" @default.
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- W2949757467 date "2016-04-26" @default.
- W2949757467 modified "2023-09-27" @default.
- W2949757467 title "Enclosure of the Numerical Range of a Class of Non-Selfadjoint Rational Operator Functions" @default.
- W2949757467 hasPublicationYear "2016" @default.
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