Abstract
In this paper we characterize the spectrum of strongly continuous cosine functions, defined in a Hilbert space, in terms of properties of the infinitesimal generator.
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Lizama, C. On the spectrum of cosine operator functions. Integr equ oper theory 12, 713–724 (1989). https://doi.org/10.1007/BF01194559
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DOI: https://doi.org/10.1007/BF01194559