On Vassiliev invariants of braid groups of the sphere.

abstract: We construct a universal Vassiliev invariant for braids of the sphere and the mapping class groups of the sphere with \(n\) punctures. The case of a sphere is different from the classical braid groups or braids of oriented surfaces of genus strictly greater than zero, in the case of a sphere Vassiliev invariants in a group without 2-torsion does not distinguish elements of braids.

timetable:
Thu 26 May, 14:45 - 15:30, Aula Dini
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