منابع مشابه
Classification Conceptuelle avec Généralisation par Intervalles
Résumé. Nous nous intéressons aux méthodes de classification hiérarchique ou pyramidale, où chaque classe formée correspond à un concept, i.e. une paire (extension, intension), considérant des données décrites par des variables quantitatives à valeurs réelles ou intervalles, ordinales et/ou prenant la forme de distribution de probabilités/fréquences sur un ensemble de catégories. Les concepts s...
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We prove a recent conjecture of Lassalle about positivity and integrality of coefficients in some polynomial expansions. We also give a combinatorial interpretation of those numbers. Finally, we show that this question is closely related to the fundamental problem of calculating the linearization coefficients for binomial coefficients.
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Let [n] be theset {1,2, *.. , n> and CT a given permutation in S,, the symmetric group on [n]. The (unsigned) Stirling numbers of the first kind enumerate the permutations on En] with k cycles and those of the second kind give the number partitions of [n] having k blocks. In this paper we compute the number of permutations on [n] with k cycles and the number of partitions on [n] having k blocks...
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ژورنال
عنوان ژورنال: Journal de Théorie des Nombres de Bordeaux
سال: 2005
ISSN: 1246-7405
DOI: 10.5802/jtnb.506