Closed hereditary coreflective subcategories in epireflective subcategories of Top
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Veronika Pitrová
Abstract
The aim of this paper is to investigate closed hereditary coreflective subcategories in epireflective subcategories A of Top, mainly in the case that ZD ⊆ A ⊆ Tych. Particularly the closed hereditary coreflective hull of the one-point compactification of the discrete space on the set of all non-negative integers in such epireflective subcategories is studied. It is proved that under some set-theoretic assumptions it is the whole category A.
Acknowledgement
I would like to thank J. Činčura for his help and lots of useful comments.
References
[1] Adámek, J.—Herrlich, H.—Strecker, G. E.: Abstract and concrete categories, online edition, available from http://katmat.math.uni-bremen.de/accSearch in Google Scholar
[2] Arkhangel’skii, A. V.—Ponomarev, V. I.: Fundamentals of General Topology: Problems and Exercises, D. Reidel Publishing Company, Dordrecht, 1983.Search in Google Scholar
[3] Balcar, B.—Hušek, M.: Sequentially continuous mappings and realvalued measurable cardinals, Topology Appl. 111 (2001), 49–58.10.1016/S0166-8641(99)00197-2Search in Google Scholar
[4] Bukovský, L.: The Structure of the Real Line, VEDA, Vydavatel’stvo Slovenskej akadémie vied, Bratislava, 1979.Search in Google Scholar
[5] Choodnovsky, D. V.: Sequentially continuous mappings and realvalued measurable cardinals, In: Infinite and finite sets, Keszthely, 1973, Colloq. Math. Soc. János Bolyai 10 (1975) 275–288.Search in Google Scholar
[6] Člnčura, J.: Heredity and coreflective subcategories of the category of topological spaces, Appl. Categ. Structures 9 (2001), 131–138.10.1023/A:1008642620193Search in Google Scholar
[7] Člnčura, J.: Hereditary coreflective subcategories of categories of topological spaces, Appl. Categ. Structures 13 (2005), 329–342.10.1007/s10485-005-8848-zSearch in Google Scholar
[8] Člnčura, J.: Hereditary coreflective subcategories of the categories of Tychonoff and zero-dimensional spaces, Appl. Categ. Structures 21 (2013), 671–679.10.1007/s10485-012-9285-4Search in Google Scholar
[9] Engelking, R.: General Topology, Revised and completed edition, Heldermann Verlag, Berlin, 1989.Search in Google Scholar
[10] Herrlich, H.—Hušek, M.: Some open categorical problems in Top, Appl. Categ. Structures 1 (1993), 1–19.10.1007/BF00872983Search in Google Scholar
[11] Lacková, V.: Closed hereditary additive and divisible subcategories in epireflective subcategories of Top, Acta Math. Univ. Comenian. 83 (2014), 135–146.Search in Google Scholar
[12] Noble, N.: The continuity of functions on cartesian products, Trans. Amer. Math. Soc. 149 (1970), 187–198.10.1090/S0002-9947-1970-0257987-5Search in Google Scholar
[13] Sleziak, M.: On hereditary coreflective subcategories of Top, Appl. Categ. Structures 12 (2004), 301–317.10.1023/B:APCS.0000031207.53918.1eSearch in Google Scholar
[14] Sleziak, M.: Hereditary, additive and divisible classes in epireflective subcategories of Top, Appl. Categ. Structures 16 (2008), 451–478.10.1007/s10485-006-9034-7Search in Google Scholar
© 2017 Mathematical Institute Slovak Academy of Sciences
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Articles in the same Issue
- State hoops
- On derivations of partially ordered sets
- Interior and closure operators on commutative basic algebras
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