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We investigate power series that converge to a bounded function on the real line. First, we establish relations between coefficients of a power series and boundedness of the resulting function; in particular, we show that boundedness can be prevented by certain Turán inequalities and, in the case of real coefficients, by certain sign patterns. Second, we show that the set of bounded power series naturally supports three topologies and that these topologies are inequivalent and incomplete. In each case, we determine the topological completion. Third, we study the algebra of bounded power series, revealing the key role of the backward shift operator.
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Davide Sclosa (Tue,) studied this question.
www.synapsesocial.com/papers/68e6e098b6db64358765bf54 — DOI: https://doi.org/10.1016/j.jmaa.2024.128448
Davide Sclosa
Journal of Mathematical Analysis and Applications
Vrije Universiteit Amsterdam
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