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Properties of the semigroup in \(L_1\) associated with age-structured diffusive properties. (English) Zbl 07785977

Summary: The linear semigroup associated with age-structured diffusive populations is investigated in the \(L_1\)-setting. A complete determination of its generator is given along with detailed spectral information that imply, in particular, an asynchronous exponential growth of the semigroup. Moreover, regularizing effects inherited from the diffusion part are exploited to derive additional properties of the semigroup.

MSC:

47D06 One-parameter semigroups and linear evolution equations
47A10 Spectrum, resolvent
35K90 Abstract parabolic equations
35M10 PDEs of mixed type
92D25 Population dynamics (general)

References:

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[25] D-30167 Hannover Germany E-MAIL: walker@ifam.uni-hannover.de KEY WORDS AND PHRASES: Age structure, semigroups of linear operators, parabolic evolution operators, asynchronous exponential growth. 2010 MATHEMATICS SUBJECT CLASSIFICATION: 47D06, 47A10, 35K90, 35M10, 92D25. Received: September 7, 2021. · doi:10.1007/978-3-540-78273-5_1
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