Author(s): Clementino, Maria Manuel ; Janelidze, George
Date: 2020
Persistent ID: https://hdl.handle.net/10316/89423
Origin: Estudo Geral - Universidade de Coimbra
Subject(s): Monad; Effective descent morphism; Relational algebra; Ultrafilter monad; Locally finite space; Hausdorff space; Alexandrov space
We make three independent observations on characterizing effective descent morphisms in the category of topological spaces. The first of them proposes a new modification of known characterizations of effective descent morphisms of general spaces, while the other two are devoted to locally finite and Hausdorff spaces, respectively. The Hausdorff case is considered, as far as we could, at the more general level of relational algebras in the sense of M. Barr.
