Eduard Ortega (NTNU Trondheim)
Left cancellative small categories and their associated algebras
Abstract: In this talk I will explain how to associate an étale groupoid to a left cancellative small category. We will show that certain categories with a length function can be written as a Zappa-Zsép product of a free subcategory and the groupoid of invertible elements. This talk is based in a common project with Enrique Pardo.