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L -functions of automorphic forms and combinatorics: Dyck paths

Laurent Habsieger, Emmanuel Royer (2004)

Annales de l'Institut Fourier

We give a combinatorial interpretation for the positive moments of the values at the edge of the critical strip of the L -functions of modular forms of G L ( 2 ) and G L ( 3 ) . We deduce some results about the asymptotics of these moments. We extend this interpretation to the moments twisted by the eigenvalues of Hecke operators.

La conjecture de Dickson et classes particulières d’entiers

Abdelmadjid Boudaoud (2006)

Annales mathématiques Blaise Pascal

En admettant la conjecture de Dickson, nous démontrons que, pour chaque couple d’entiers q > 0 et k > 0 , il existe une partie infinie L q , k telle que, pour chacun des entiers n L q , k et tout entier s tel que 0 < s q , on ait n + s = s t 1 . . . t k t 1 < . . . < t k sont des nombres premiers. De même, pour chaque couple d’entiers q > 0 et k > 0 , il existe une partie infinie M q , k telle que, pour chacun des entiers n M q , k et tout entier s (nul ou non ) de l’intervalle - q , q , on ait n + s = l t 1 . . . t k t 1 < . . . < t k sont des nombres premiers et l’entier l appartient à l’intervalle 1 , 2 q + 1 . La lecture non standard...

Lacunary formal power series and the Stern-Brocot sequence

Jean-Paul Allouche, Michel Mendès France (2013)

Acta Arithmetica

Let F ( X ) = n 0 ( - 1 ) ε X - λ be a real lacunary formal power series, where εₙ = 0,1 and λ n + 1 / λ > 2 . It is known that the denominators Qₙ(X) of the convergents of its continued fraction expansion are polynomials with coefficients 0, ±1, and that the number of nonzero terms in Qₙ(X) is the nth term of the Stern-Brocot sequence. We show that replacing the index n by any 2-adic integer ω makes sense. We prove that Q ω ( X ) is a polynomial if and only if ω ∈ ℤ. In all the other cases Q ω ( X ) is an infinite formal power series; we discuss its algebraic...

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