Abstract
We characterize nearness frames whose completions are fine (we call them quotient-fine), and show that the subcategory QfNFrm they form is reflective in the category of strong nearness frames. The resulting functor commutes with the completion functor. QfNFrm is isomorphic to the subcategory of the functor category (RegFrm)2 given by the dense onto \(h\colon M\to L\), where 2 denotes the category with only two objects and exactly one morphism between them.
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Banaschewski, B.: Uniform completion in pointfree topology. In: Topological and Algebraic Structures in Fuzzy Sets, vol. 20, pp. 19–56. Trends Log. Stud. Log. Libr. Kluwer, Dordrecht (2003)
Banaschewski, B., Hong, S.S.: Filters and strict extensions of frames. Kyungpook Math. J. 39, 215–230 (1999)
Banaschewski, B., Hong, S.S.: General filters and strict extensions in pointfree topology. Kyungpook Math. J. 42, 273–283 (2002)
Banaschewski, B., Hong, S.S., Pultr, A.: On the completion of nearness frames. Quaest. Math. 28, 19–37 (1998)
Banaschewski, B., Pultr, A.: Paracompactness revisited. Appl. Categ. Struct. 1, 181–190 (1993)
Banaschewski, B., Pultr, A.: Cauchy points of uniform and nearness frames. Quaest. Math. 19, 107–127 (1996)
Bentley, H.L., Herrlich, H.: Extensions of topological spaces. In: Franklin, S.P., Smith-Thomas, B.V. (eds.) Topology, Proceedings of the Memphis State University Conference, 1975, pp. 129–184. Marcel Dekker, New York (1976)
Herrlich, H., Strecker, G.E.: Category Theory. Allyn and Bacon, Boston (1973)
Johnstone, P.T.: Stone Spaces. Cambridge Univ. Press, Cambridge (1982)
Picado, J., Pultr, A.: Locales treated mostly in a covariant way. In: Textos de Matemática. Série B [Texts in Mathematics. Series B], vol. 41, xii+104 pp. Universidade de Coimbra, Departamento de Matemática, Coimbra (2008)
Zenk, E.R.: Monocoreflections of completely regular frames. Appl. Categ. Struct. 15, 209–222 (2007)
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Dube, T., Mugochi, M.M. Thoughts on Quotient-fine Nearness Frames. Appl Categor Struct 19, 511–521 (2011). https://doi.org/10.1007/s10485-009-9216-1
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DOI: https://doi.org/10.1007/s10485-009-9216-1