Quebec Mathematical Sciences Colloquium

November 7, 2008 from 16:00 to 18:00 (Montreal/Miami time) On location

Combinatorial Hopf Algebras

Colloquium presented by Jean-Louis Loday (CNRS, Strasbourg)

Many recent papers are devoted to some infinite dimensional Hopf algebras called collectively "combinatorial Hopf algebras". Among the examples we find the Faa di Bruno algebra, the Connes-Kreimer algebra and the Malvenuto-Reutenauer algebra. We give a precise definition of such an object and we provide a classification. We show that the notion of preLie algebra and of brace algebra play a key rol

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