Elimination of generators in partially commutative structures. (Élimination de générateurs dans les structures partiellement commutatives.)
Duchamp, Gérard (1991)
Séminaire Lotharingien de Combinatoire [electronic only]
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Duchamp, Gérard (1991)
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Duchamp, Gérard (1993)
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Francesco Amoroso, Sinnou David (2000)
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1. Introduction. Dans un article célèbre, D. H. Lehmer posait la question suivante (voir [Le], §13, page 476): «The following problem arises immediately. If ε is a positive quantity, to find a polynomial of the form: where the a’s are integers, such that the absolute value of the product of those roots of f which lie outside the unit circle, lies between 1 and 1 + ε (...). Whether or not the problem has a solution for ε < 0.176 we do not know.» Cette question, toujours ouverte,...
R. Paysant-Le Roux (1994)
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