Mathematics Colloquia and Seminars

Return to Colloquia & Seminar listing

Concordance in homology cobordisms

Geometry/Topology

Speaker: Tye Lidman, North Carolina State University
Related Webpage: http://www4.ncsu.edu/~tlidman/
Location: 2112 MSB
Start time: Thu, Oct 5 2017, 3:10PM

Not all knots bound a disk in the three-sphere, but they do always bound a PL disk in the four-ball. It turns out that this fails for knots in arbitrary homology spheres. We study a group that measures this failure and show that it is infinitely-generated. This is joint work with Jen Hom and Adam Levine.