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

Peter Bundschuh, Keijo 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 > 0 , has been considered from the arithmetical point of view. Coons [8] proved the transcendence of A ( α ) for every algebraic α with 0 < | α | < 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 [4] studied the twisted version ( b n ) of Stern’s sequence, defined by b 0 : = 0 , b 1 : = 1 , and b 2 n : = - b n , b 2 n + 1 : = - ( b n + b n + 1 ) for any n > 0 .The aim of our paper is to show...

Birational transformations and values of the Riemann zeta-function

Carlo Viola (2003)

Journal de théorie des nombres de Bordeaux

In his proof of Apery’s theorem on the irrationality of ζ ( 3 ) , Beukers [B] introduced double and triple integrals of suitable rational functions yielding good sequences of rational approximations to ζ ( 2 ) and ζ ( 3 ) . Beukers’ method was subsequently improved by Dvornicich and Viola, by Hata, and by Rhin and Viola. We give here a survey of our recent results ([RV2] and [RV3]) on the irrationality measures of ζ ( 2 ) and ζ ( 3 ) based upon a new algebraic method involving birational transformations and permutation groups...

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