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Une formule d'interpolation en deux variables

Damien Roy — 2001

Journal de théorie des nombres de Bordeaux

On démontre une formule d’interpolation pour une fonction F ( z , w ) de deux variables complexes qui tient compte des valeurs de cette fonction ainsi que de ses dérivées partielles par rapport à w en des points d’un sous-groupe de 𝐂 2 de rang 2 . On explique préalablement comment, dans les grandes lignes, une telle formule permet de ramener la conjecture de Schanuel à un énoncé dont la forme est celle d’un critère d’indépendance algébrique.

Interpolation sur des perturbations d’ensembles produits

Damien Roy — 2002

Bulletin de la Société Mathématique de France

On démontre un résultat concernant l’interpolation de fonctions analytiques sur une perturbation d’ensemble produit qui, dans le cas p -adique, répond à une conjecture de P.Robba et, dans le cas complexe, complète des résultats antérieurs de E.Bombieri, S.Lang, D.Masser, J.-C.Moreau et M.Waldschmidt.

Rational approximation to real points on conics

Damien Roy — 2013

Annales de l’institut Fourier

A point ( ξ 1 , ξ 2 ) with coordinates in a subfield of of transcendence degree one over , with 1 , ξ 1 , ξ 2 linearly independent over , may have a uniform exponent of approximation by elements of 2 that is strictly larger than the lower bound 1 / 2 given by Dirichlet’s box principle. This appeared as a surprise, in connection to work of Davenport and Schmidt, for points of the parabola { ( ξ , ξ 2 ) ; ξ } . The goal of this paper is to show that this phenomenon extends to all real conics defined over , and that the largest exponent of...

Sur l'approximation algébrique en degré de transcendance un

Michel LaurentDamien Roy — 1999

Annales de l'institut Fourier

Soient 𝒞 une courbe algébrique affine de m définie sur , et θ _ un point de 𝒞 qui n’est pas algébrique. On démontre l’existence d’une infinité de “bonnes” approximations de θ _ par des points algébriques de 𝒞 de degré et taille bornés, les majorants du degré et de la taille étant choisis à l’intérieur de suites satisfaisant certaines conditions de croissance modérée. On établit aussi une minoration du degré de ces bonnes approximations, raffinant ainsi un résultat de Wirsing. Comme corollaire, nous...

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