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https://hdl.handle.net/10316/11468
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. | URI: | https://hdl.handle.net/10316/11468 | Rights: | openAccess |
Appears in Collections: | FCTUC Matemática - Artigos em Revistas Nacionais |
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Finite preorders and topological descent II.pdf | 154.64 kB | Adobe PDF | View/Open |
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