Orateur: Anthony Conway (Université de Genève) :
Titre:  Tangles and signatures.
Résumé:  Given a braid, taking the signature of its closure provides a map from the braid group to the integers. The multiplicative default of this signature map can be computed in terms of the Burau representation. In this talk, I will express the multiplicative default of the multivariable signature of colored tangles in terms of an isotropic functor.

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