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The Davenport constant of a box

Alain Plagne — 2015

Acta Arithmetica

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 i I x i 0 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...

A propos de la fonction X d’Erdös et Graham

Alain Plagne — 2004

Annales de l’institut Fourier

Nous améliorons les meilleures bornes supérieures et inférieures connues pour la fonction X d’Erdös et Graham définie par X ( h ) = max h 𝒜 max a 𝒜 * ord * ( 𝒜 a ) , où le premier maximum est pris sur toutes les bases (exactes) 𝒜 d’ordre au plus h , où 𝒜 * désigne le sous-ensemble de 𝒜 composé des éléments a tels que 𝒜 { a } soit encore une base et où, enfin, ord * ( 𝒜 ) désigne l’ordre (exact) de 𝒜 . 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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