Abstract
In this chapter, we recall the definition and some basic properties of almost periodic functions with values in a (real) Hilbert space and we establish a necessary and sufficient condition for all solutions of (2.1.7)–(2.1.8) to be almost periodic: \(\mathbb {R} \rightarrow {V}\).
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Haraux, A. (2018). Almost Periodic Functions and the Abstract Wave Equation. In: Nonlinear Vibrations and the Wave Equation. SpringerBriefs in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-319-78515-8_3
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DOI: https://doi.org/10.1007/978-3-319-78515-8_3
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Publisher Name: Springer, Cham
Print ISBN: 978-3-319-78514-1
Online ISBN: 978-3-319-78515-8
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