Webinaire Cirget: «Topologically embedding spheres in knot traces»

Conférencier: Patrick Orson, Boston College 

Résumé / Abstract: Knot traces are smooth 4-manifolds with boundary, that are homotopic to the 2-sphere, and obtained by attaching a 2-handle to the 4-ball along a framed knot in the 3-sphere. I will give a complete characterisation for when the generator of the second homotopy group of a knot trace can be represented by a locally flat embedded 2-sphere with abelian exterior fundamental group. The answer is in terms of classical and computable invariants of the knot. This is a joint project with Feller, Miller, Nagel, Powell, and Ray. 

Le lien pour se connecter est :  https://uqam.zoom.us/j/98999725241 

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vendredi 22 mai 2020
11 h à 12 h

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En ligne
Montréal (Québec)

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