University of Cambridge > Talks.cam > Topology Seminar > Pretzel knots with unknotting number one

Pretzel knots with unknotting number one

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  • UserJulian Gibbons (Imperial)
  • ClockTuesday 07 February 2012, 15:00-16:00
  • HouseMR15.

If you have a question about this talk, please contact Dr Andras Juhasz.

The unknotting number u(K) of a knot is a deceptively difficult invariant to compute. In this talk, I will explain how various obstructions to u(K) = 1 can be applied to pretzels, and provide a partial classification of such knots with u(K) = 1. These techniques will be a mixture of classical theory and the more recent Heegaard Floer homology by Ozsvath and Szabo.

This talk is part of the Topology Seminar series.

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