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An extremal problem and inequalities for entire functions of exponential type

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arxiv 2304.05337 v2 pith:6RS3HQ5M submitted 2023-04-11 math.CA math.CV

classification math.CAmath.CV
keywords entireproblemexponentialfunctionfunctionsinequalitiestypeadditional
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We study two variations of the classical one-delta problem for entire functions of exponential type, known also as the Carath\'eodory--Fej\'er--Tur\'an problem. The first variation imposes the additional requirement that the function is radially decreasing while the second one is a generalization which involves derivatives of the entire function. Various interesting inequalities, inspired by results due to Duffin and Schaeffer, Landau, and Hardy and Littlewood, are also established.

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