Polynomial growth of sumsets in abelian semigroups
Journal de Théorie des Nombres de Bordeaux, Volume 14 (2002) no. 2, pp. 553-560.

Let S be an abelian semigroup, and A a finite subset of S. The sumset hA consists of all sums of h elements of A, with repetitions allowed. Let |hA| denote the cardinality of hA. Elementary lattice point arguments are used to prove that an arbitrary abelian semigroup has polynomial growth, that is, there exists a polynomial p(t) such that |hA|=p(h) for all sufficiently large h. Lattice point counting is also used to prove that sumsets of the form h 1 A 1 ++h r A r have multivariate polynomial growth.

Soit S un semi-groupe abélien et A un sous-ensemble fini de S. On désigne par hA l’ensemble de toutes les sommes de h éléments de A, et par |hA| son cardinal. On montre, par des arguments élémentaires de comptage de points dans les réseaux, qu’il existe un polynôme p(t) tel que pour tout entier h assez grand |hA|=p(h). Plus généralement, on étend ce résultat aux ensembles h 1 A 1 ×+h r A r en obtenant la croissance polynomiale du cardinal en termes des variables h 1 ,h 2 ,,h r .

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     title = {Polynomial growth of sumsets in abelian semigroups},
     journal = {Journal de Th\'eorie des Nombres de Bordeaux},
     pages = {553--560},
     publisher = {Universit\'e Bordeaux I},
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Melvyn B. Nathanson; Imre Z. Ruzsa. Polynomial growth of sumsets in abelian semigroups. Journal de Théorie des Nombres de Bordeaux, Volume 14 (2002) no. 2, pp. 553-560. doi : 10.5802/jtnb.374. https://jtnb.centre-mersenne.org/articles/10.5802/jtnb.374/

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