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Given an additively written abelian group G and a set X ⊆ G, we let (X) denote the monoid of zero-sum sequences over X and (X) the Davenport constant of (X), namely the supremum of the positive integers n for which there exists a sequence x₁⋯xₙ in (X) such that for each non-empty proper subset I of 1,...,n. In this paper, we mainly investigate the case when G is a power of ℤ and X is a box (i.e., a product of intervals of G). Some mixed sets (e.g., the product of a group by a box) are studied...
Nous améliorons les meilleures bornes supérieures et inférieures connues pour la fonction
d’Erdös et Graham définie par , où le premier maximum est pris sur
toutes les bases (exactes) d’ordre au plus , où désigne le
sous-ensemble de composé des éléments tels que soit encore une base et où, enfin, désigne l’ordre (exact) de
. Notre étude nous conduira, entre autres, à prouver un nouveau résultat
additif général découlant de la méthode isopérimétrique et à étudier trois problèmes
additifs...
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