Bonn Topology Group - Abstracts
General Information - Members - Activities - Topology Seminar
Talk
December 5, 2023
Giles Gardam (Universität Bonn): The Kaplansky conjectures
Abstract
There is a series of four conjectures on group rings attributed to Kaplansky. For example, the zero divisor says that the group ring of a torsion-free group over a field has no zero divisors and the unit conjecture says that its units are all scalar multiples of group elements. I will discuss these conjectures, their relationship to other questions, and why the unit conjecture is false, including new counterexamples.
Back to seminar pageNews
Bonn mathematics performs excellently again in QS ranking
Stefan Schwede is invited speaker at the ECM 2024 in Sevilla
Jessica Fintzen wins Cole Prize
Regula Krapf receives university teaching award
Catharina Stroppel joined the North Rhine-Westphalia Academy for Sciences and Arts
Daniel Huybrechts receives the Compositio Prize for the periode 2017-2019
Catharina Stroppel receives Gottfried Wilhelm Leibniz Prize 2023
Grants for Mathematics students from Ukraine
Jessica Fintzen is awarded a Whitehead Prize of the London Mathematical Society
Peter Scholze elected as Foreign Member of the Royal Society