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Speaker:
Mark Powell
Affiliation:
Durham University, UK
Date:
Thu, 19/09/2019 - 11:30 - 12:20
Location:
MPIM Lecture Hall
Parent event:
Workshop on 4-manifolds, September 16 - 20, 2019 I will explain the definition of the Kervaire-Milnor invariant of an immersed 2-sphere in a 4-manifold, which obstructs the sphere being homotopic to an embedding. I will describe two instances in 4-manifold classification where this invariant appears, one in the sphere embedding theorem and one in stable classification.
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