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Title: Finite preorders and topological descent II: étale descent
Authors: Janelidze, George 
Sobral, Manuela 
Issue Date: 2000
Publisher: Centro de Matemática da Universidade de Coimbra
Citation: Pré-Publicações DMUC. 00-33 (2000)
Abstract: It is known that every effective (global-) descent morphism of topological spaces is an effective etale-descent morphism. On the other hand, in the predecessor of this paper we gave examples of: a descent morphism that is not an effective etale-descent morphism; an effective etale-descent morphism that is not a descent morphism. Both of the examples in fact involved only finite topological spaces, i.e. just finite preorders, and now we characterize the effective etale-descent morphisms of preorders/finite topological spaces completely.
Rights: openAccess
Appears in Collections:FCTUC Matemática - Artigos em Revistas Nacionais

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