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Slices of groupoids are group-like

Research output: Contribution to Journal/MagazineJournal article

<mark>Journal publication date</mark>7/02/2020
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


Given a category, one may construct slices of it. That is, one builds a new category whose objects are the morphisms from the category with a fixed codomain and morphisms certain commutative triangles. If the category is a groupoid, so that every morphism is invertible, then its slices are (connected) groupoids. We give a number of constructions that show how slices of groupoids have properties even closer to those of groups than the groupoids they come from. These include natural notions of kernels and coset spaces.