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ASYMPTOTICALLY ALMOST PERIODIC SOLUTIONS OF INHOMOGENEOUS CAUCHY PROBLEMS ON THE HALF-LINE

Published online by Cambridge University Press:  01 May 1999

WOLFGANG ARENDT
Affiliation:
Abteilung Mathematik V, Universität Ulm, 89069 Ulm, Germany
CHARLES J. K. BATTY
Affiliation:
St John's College, Oxford OX1 3JP
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Abstract

Let u be a bounded, uniformly continuous, mild solution of an inhomogeneous Cauchy problem on R+: u′(t)=Au(t)+ϕ(t) (t[ges ]0). Suppose that u has uniformly convergent means, σ(A)∩iR is countable, and ϕ is asymptotically almost periodic. Then u is asymptotically almost periodic. Related results have been obtained by Ruess and Vũ, and by Basit, using different methods. A direct proof is given of a Tauberian theorem of Batty, van Neerven and Räbiger, and applications to Volterra equations are discussed.

Type
NOTES AND PAPERS
Copyright
© The London Mathematical Society 1999

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