On the Spectrum of Cosine Functions
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Elena Schüler
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Article
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1999
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Elsevier Science
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English
⚖ 138 KB
In this paper we give characterizations of the resolvent set of the generator A of Ž . a strongly continuous cosine function C t in terms of certain solution properties Ž . Ž . Ž . of the differential equation uЉ t s Au t q f t .