SMS scnews item created by Kevin Coulembier at Fri 23 Aug 2019 1847
Type: Seminar
Modified: Thu 5 Sep 2019 1520; Thu 5 Sep 2019 1521; Fri 6 Sep 2019 1519; Fri 6 Sep 2019 1629
Distribution: World
Expiry: 1 Nov 2019
Calendar1: 11 Oct 2019 1200-1300
CalLoc1: Carslaw 375
CalTitle1: Algebra Seminar: Congruences on categories and their ideals
Auth: kevinc@220.240.76.233 (kcou7211) in SMS-WASM

# Algebra Seminar: East -- Congruences on categories and their ideals

James East (Western Sydney University)

Friday 11 October, 12-1pm, Place: Carslaw 375

Title: Congruences on categories and their ideals

Abstract: A congruence on a category is an equivalence on morphisms that respects
objects and is compatible with composition.  Congruences are used to form quotient
categories, so play the role of normal subgroups or ideals from group and ring theory.
This talk will describe joint work with Nik Ruskuc (St Andrews), in which we classify
the congruences on many well-known categories and their ideals.  Examples include
partition categories, Brauer categories, Temperley-Lieb (planar) categories and Jones
(annular) categories, as well as several categories of (linear) transformations and
braids.  These are all applications of general results concerning ideal extensions in a
certain class of stable, von Neumann regular categories.


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