Seminars in geometry/topology

Spring 2018 - Upcoming Talks

January 29, 14:15 - 15:15, room 734, Sentralbygg 2

Magnus Bakke Botnan (TU Munich): Multidimensional Persistence and Clustering

Abstract: It is widely known that multidimensional persistent homology is "hard". But what does this really mean? In the first part of the talk I will discuss this from the point of view of representation theory of quivers. Next I will show how multidimensional clustering gives rise to multidimensional persistence modules of a particularly appealing form. Given their simplicity, it is natural to wonder if we are able to carry out persistence computations like in 1-D in the setting of clustering. I will discuss recent work with Ulrich Bauer, Steffen Oppermann and Johan Steen, which shows that this restriction alleviates the aforementioned "hardness" in only very special cases. The last part of the talk will concern how much of this complexity we see in persistence modules coming from data.

Spring 2018 - Previous Talks

2018-01-24, Marius Thaule