# Topology Seminar

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Mon., Sep. 19, 2022 1:00 p.m.
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Location: CL 312 and Live Stream
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**Speaker: **Sebastian Martensen, NTNU Trondheim

**Title: **Triangulated categories and other n-angulations

**Zoom:** https://uregina-ca.zoom.us/j/99127226830?pwd=bnFQR1R3UUdyWUxqSS9JMExMRlZwZz09

**Abstract: **

Triangulated categories were introduced to capture some of the extra structure present in the derived category of a ring and the stable homotopy category, and today they are present wherever homological algebra plays a central role. In the case of derived categories, the triangulation captures certain “shadows” of short and long exact sequences, and so one may wonder: are there categories that capture only long exact sequences of a certain length? This led to the introduction of n-angulated categories in 2013 by Geiss, Keller, and Oppermann. Today, they find their use in representation theory, and it is a hope that they will one day play a role in topology as well. For this talk we will discuss triangulated categories, stable module categories, and introduce n-angulated categories along with their main class of examples.

This event is supported by PIMS.