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Constantes de Sobolev des arbres

Marc Bourdon (2007)

Bulletin de la Société Mathématique de France

Étant donnés p [ 1 , + [ et un arbre T dont chaque sommet est de valence au moins  3 , on étudie la constante de Sobolev d’exposant p de T , c’est-à-dire la plus petite constante σ p telle que pour tout u p ( T 0 ) on ait u p p σ p d u p p . Notre motivation vient de la recherche de graphes finis avec des petites constantes de Poincaré d’exposant  p , en vue d’obtenir des exemples de groupes qui ont la propriété de point fixe sur les espaces L p .

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