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Absolutely monotonic functions related to the asymptotic formula for the complete elliptic integral of the first kind (2405.19651v1)

Published 30 May 2024 in math.CA

Abstract: Let $\mathcal{K}\left( x\right) $ be the complete elliptic integral of the first kind and \begin{equation*} \mathcal{G}{p}\left( x\right) =e{\mathcal{K}\left( \sqrt{x} \right) }-\frac{p}{\sqrt{1-x}} \end{equation*} for $p\in \mathbb{R}$ and $x\in \left( 0,1\right) $. In this paper we find the necessary and sufficient conditions for the functions $\pm \mathcal{G} _{p}{\left( k\right) }\left( x\right) $ ($k\in \mathbb{N\cup }\left{ 0\right} $) to be absolutely monotonic on $\left( 0,1\right) $, which extend previous known results and yield several new functional inequalities involving the complete elliptic integral of the first kind. More importantly, we provide a new method to deal with those absolute monotonicity problem by proving the monotonicity of a sequence generated by the coefficients of the power series of $\mathcal{G}{p}\left( x\right) $.

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