Conway’s Question: The Chase for Completeness



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Dikranjan, Dikran and Martín Peinador, Elena and Tarieladze, Vaja (2007) Conway’s Question: The Chase for Completeness. Applied Categorical Structures, 15 (5-6). pp. 511-539. ISSN 0927-2852

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We study various degrees of completeness for a Tychonoff space X. One of them plays a central role, namely X is called a Conway space if X is sequentially closed in its Stone–Čech compactification β X (a prominent example of Conway spaces is provided by Dieudonné complete spaces). The Conway spaces constitute a bireflective subcategory Conw of the category Tych of Tychonoff spaces. Replacing sequential closure by the general notion of a closure operator C, we introduce analogously the subcategory Conw C of C-Conway spaces, that turns out to be again a bireflective subcategory of Tych. We show that every bireflective subcategory of Tych can be presented in this way by building a Galois connection between bireflective subcategories of Tych and closure operators of Top finer than the Kuratowski closure. Other levels of completeness are considered for the (underlying topological spaces of) topological groups. A topological group G is sequentially complete if it is sequentially closed in its Raĭkov completion . The sequential completeness for topological groups is stronger than Conway’s property, although they coincide in some classes of topological groups, for example: free (Abelian) topological groups, pseudocompact groups, etc.

Item Type:Article
Uncontrolled Keywords:Dieudonné-complete space; Conway space; Stone–Čech compactification; Compact abelian group; Pseudocompact group; Sequentially complete group; Functionally bounded set; Closure operator; Bireflective subcategory; Galois connection
Subjects:Sciences > Mathematics > Topology
ID Code:12710
Deposited On:13 May 2011 11:18
Last Modified:12 Dec 2018 15:13

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