Knotted surfaces in 4manifolds and distances between them
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 Oliver Singh, Durham
 Wednesday 06 November 2019, 16:0017:00
 MR13.
If you have a question about this talk, please contact Ivan Smith.
I will discuss knotted surfaces, isotopy classes of embedded surfaces in a given 4manifold, and will define two notions of distance between them. These distances are integervalued and are defined topologically: one in terms of regular homotopy; another in terms of stabilisation, a form of embedded surgery. I will outline a proof of an inequality between these distances; the proof is constructive and draws upon ideas pioneered by Gabai in the proof of the 4dimensional light bulb theorem.
This talk is part of the Differential Geometry and Topology Seminar series.
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