# Déformations d'algèbres de Hopf combinatoires et inversion de Lagrange non commutative

Abstract : This thesis is devoted to study one-parameter families of coproducts on symmetric functionsand their noncommutative analogues. We show, by introducing an appropriate basis,that a one-parameter family of Hopf algebras introduced by Foissy interpolates between theFaa di Bruno algebra and the Farahat-Higman algebra. The structure constants in this basisare deformations of the structure constants of the Farahat-Higman algebra in the basis ofprojections of conjugacy classes. For these deformed structure constants, we obtain an analogueof the Macdonald formulas.Foissy has also introduced a noncommutative analogue of this family of Hopf algebras. Itinterpolates between the Hopf algebra of noncommutative symmetric functions and the noncommutativeFaa di Bruno algebra. First, we give a new combinatorial interpretation ofthe Brouder-Frabetti-Krattenthaler formula for the antipode of the noncommutative Faa diBruno algebra, that is a form of the noncommutative Lagrange inversion formula. Then, wegive a one-parameter deformation of this formula. Namely, it is an explicit formula for theantipode of the noncommutative family.We also give other combinatorial properties of the noncommutative Faa di Bruno algebra,and other results about the families of Hopf algebras of Foissy. In this way, we generalize otherforms of the noncommutative Lagrange inversion formula. Namely, we give other formulasfor the antipode of the noncommutative family.
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Cited literature [10 references]

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• HAL Id : pastel-00674122, version 1

### Citation

Jean-Paul Bultel. Déformations d'algèbres de Hopf combinatoires et inversion de Lagrange non commutative. Autre [cs.OH]. Université Paris-Est, 2011. Français. ⟨NNT : 2011PEST1006⟩. ⟨pastel-00674122⟩

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