Séminaire de Combinatoire du Plateau de Saclay

LIX

Le séminaire combinatoire du plateau de Saclay est organisé tous les mercredi à 11h conjointement par l'équipe du Combi du LIX et l'équipe GALaC. Si vous souhaitez donner un exposé ou recevoir les annonces, merci de contacter l'un des organisateurs :

Les archives du séminaires (2006 -- 2017) sont disponibles sur l'ancienne page

Séminaires récents et à venir

Mobius functions for real hyperplane arrangements.

-- Marcelo Aguiar (Cornell Univ.)

We discuss the beginnings of a theory of noncommutative Mobius functions and its connections to the structure of the algebra of faces of a hyperplane arrangement. It is to be seen as a generalization of the theory of Mobius functions for lattices, developed by Rota and his school in the ...

A proof-theoretic analysis of the rotation lattice of binary trees

-- Noam Zeilberger (Birmingham University)

Join seminar with the Parsifal team The classical Tamari lattice Yn is defined as the set of binary trees with n internal nodes, with the partial ordering induced by the (right) rotation operation. It is not obvious why Yn is a lattice, but this was first proved by Haya Friedman ...

Generalized Jucys-Murphy elements and canonical idempotents in towers of algebras

-- Aaron Lauve (Loyola Univ., Chicago)

The collection of symmetric group algebras serves as a motivating example for what I'll call a multiplicity-free tower of finite dimensional algebras. Any such family has a canonical complete set of pairwise orthogonal primitive idempotents stemming from its representation theory. In the case of the symmetric group algebras, these ...

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