Grothendieck groups of triangulated categories with higher cluster tilting subcategories

Francesca Fedele (Newcastle University)

Wednesday 8th May, 2019 14:00-15:00 Maths 116


Let C be a suitable triangulated category with a Serre functor and an n-cluster tilting subcategory T= add(t), for some integer n>1. In this setup, every indecomposable in T appears in a so called Auslander-Reiten (n+2)-angle in T. We show that the Grothendieck group of C can be expressed as a quotient of the split Grothendieck group of T by some elements determined by the Auslander-Reiten (n+2)-angles in T.

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