Topological Quantum Field Theory Seminar   RSS

11/03/2005, 16:30 — 17:30 — Amphitheatre Pa2, Mathematics Building
João Faria Martins, Instituto Superior Técnico

Categorical Groups, Knots and Knotted Surfaces

We define an invariant of knots and an invariant of knotted surfaces from any finite categorical group (crossed module of groups). We illustrate its non-triviality by calculating an explicit example, namely the Spun Trefoil. The talk will be based on:
[1] João Faria Martins, Categorical Groups, Knots and Knotted Surfaces.

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Current organizers: José MourãoRoger Picken, Marko Stošić


FCT Projects PTDC/MAT-GEO/3319/2014, Quantization and Kähler Geometry, PTDC/MAT-PUR/31089/2017, Higher Structures and Applications.