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arxiv: 0710.5894 · v2 · pith:QK4ABHM4new · submitted 2007-10-31 · 🧮 math.CV

A version of Fabry's theorem for power series with regularly varying coefficients

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keywords coefficientspowerseriesfabrytheoremversionanalyticchanges
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For real power series whose non-zero coefficients satisfy $|a_m|^{1/m}\to~1$ we prove a stronger version of Fabry theorem relating the frequency of sign changes in the coefficients and analytic continuation of the sum of the power series.

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