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Transcendence results on the generating functions of the characteristic functions of certain self-generating sets

Peter BundschuhKeijo Väänänen — 2014

Acta Arithmetica

This article continues two papers which recently appeared in this same journal. First, Dilcher and Stolarsky [140 (2009)] introduced two new power series, F(z) and G(z), related to the so-called Stern polynomials and having coefficients 0 and 1 only. Shortly later, Adamczewski [142 (2010)] proved, inter alia, that G(α),G(α⁴) are algebraically independent for any algebraic α with 0 < |α| < 1. Our first key result is that F and G have large blocks of consecutive zero coefficients. Then, a Roth-type...

Transcendence results on the generating functions of the characteristic functions of certain self-generating sets, II

Peter BundschuhKeijo Väänänen — 2015

Acta Arithmetica

This article continues a previous paper by the authors. Here and there, the two power series F(z) and G(z), first introduced by Dilcher and Stolarsky and related to the so-called Stern polynomials, are studied analytically and arithmetically. More precisely, it is shown that the function field ℂ(z)(F(z),F(z⁴),G(z),G(z⁴)) has transcendence degree 3 over ℂ(z). This main result contains the algebraic independence over ℂ(z) of G(z) and G(z⁴), as well as that of F(z) and F(z⁴). The first statement is...

Algebraic independence of the generating functions of Stern’s sequence and of its twist

Peter BundschuhKeijo Väänänen — 2013

Journal de Théorie des Nombres de Bordeaux

Very recently, the generating function A ( z ) of the Stern sequence ( a n ) n 0 , defined by a 0 : = 0 , a 1 : = 1 , and a 2 n : = a n , a 2 n + 1 : = a n + a n + 1 for any integer n &gt; 0 , has been considered from the arithmetical point of view. Coons [8] proved the transcendence of A ( α ) for every algebraic α with 0 &lt; | α | &lt; 1 , and this result was generalized in [6] to the effect that, for the same α ’s, all numbers A ( α ) , A ( α ) , A ( α ) , ... are algebraically independent. At about the same time, Bacher [

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