Lecture courses

01.04.2019 - 15.06.2019 |

J. McCammond

30 April - 2 May

30 April, 1 and 2 May - room 321

Title: Braid groups and non-positive curvature

Abstract: The classical theory of non-positive curvature (as found for example in Bridson and Haefliger) is well established, highly studied and an important part of geometric group theory.  In this short course I briefly review the main theorems that can be used to construct non-positively curved spaces and groups. Then I highlight the limitations of these constructions by focusing on a concrete collection of piecewise Euclidean classifying spaces for the braid groups which are highly likelyto be non-positively curved, but which are not yet known to be non-positively curved even after multiple investigations.   I conclude by describing some partial progress that my coauthors (Michael Dougherty and Stefan Witzel) and I have made on this question.

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