Orateur: Alexis Virelizier (Université Lille 1, France)
Titre: Homotopy quantum field theories.
Résumé: The Gordian distance between two links is the minimal number of crossing changes needed to deform one into the other, and the band Gordian distance between two links is the minimal number of band surgeries needed to deform one into the other. We give some criteria for these distances using the special values of the Jones polynomial.

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