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1 LMNO - Laboratoire de Mathématiques Nicolas Oresme

Abstract : In this article, we give a definition for measured quantum groupoids. We want to get objects with duality extending both quantum groups and groupoids. We base ourselves on J. Kustermans and S. Vaes- works about locally compact quantum groups that we generalize thanks to formalism introduced by M. Enock and J.M. Vallin in the case of inclusion of von Neumann algebras. From a structure of Hopf-bimodule with left and right invariant operator-valued weights, we define a fundamental pseudo-multiplicative unitary. To get a satisfying duality in the general case, we assume the existence of an antipode given by its polar decomposition. This theory is illustrated with many examples among others inclusion of von Neumann algebras M. Enock and a sub family of measured quantum groupoids with easier axiomatic.

keyword : Quantum groupoids antipode pseudo-multiplicative unitary duality

Autor: Franck Lesieur -



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