Casson-Whitney unknotting numbers of 2-spheres in the 4-sphere - TTSS 2021 - 5 min Lightning Talk
Channel: Ben Ruppik
Date: 2021-06-29

Lightning talk recorded for the Virtual Tech Topology Summer School 2021, https://ttss.math.gatech.edu/

Based on joint work with Jason Joseph, Michael Klug and Hannah Schwartz:
'Casson-Whitney Unknotting Numbers of 2-spheres in the 4-sphere'
 https://arxiv.org/abs/2007.13244
(to appear in Journal of Topology)