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A Unified view of (Complete) Regularity and Certain Variants of (Complete) Regularity

Published online by Cambridge University Press:  20 November 2018

J. K. Kohli*
Affiliation:
Lamar University, Beaumont, Texas Hindu College, University of Delhi, Delhi, India
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Regularity and complete regularity are important topological properties and several generalizations of them occur in the literature on separation axioms. The properties of certain of these variants of (complete) regularity are similar to those of (complete) regularity and their theories run, either in part or in the whole, parallel to the theory of (complete) regularity. All the more, analogies inherent in their definitions as well as the nature of results obtained in the process of their study suggest the need of formulating a coherent unified theory encompassing the theory of (complete) regularity and its generalizations. An attempt leading towards the fulfillment of this need constitutes the theme of the present paper.

Section 2 is devoted to preliminaries and basic definitions. In Section 3 we devise a framework which leads to the formulation of a unified theorv of (complete) regularity, almost (complete) regularity, ([26,], [27], [28]), (complete) s-regularity [13], (functionally) Hausdorff spaces, R1-spaces [3], and others.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 1984

References

1. Brandenburg, H., On a class of nearness spaces and the epireflective hull of developable topological spaces, Proc. of the Int. Topol. Symposium, Belgrade (1979).Google Scholar
2. Chaber, J., Remarks on open closed mappings, Fund Math. 74 (1972), 197208.Google Scholar
3. Davis, A. S., Indexed system of neighbourhoods for general topological spaces, Amer. Math. Monthly 65 (1961), 888893.Google Scholar
4. Dorsett, Charles, T0-identification spaces and R1-spaces, Kyungpook Mathematics J. 18 (1978), 167174.Google Scholar
5. Dugundji, James, Topology (Allyn and Bacon, Boston, 1966).Google Scholar
6. Engelking, R. and Mrówka, S., On E-compact spaces, Bull. Acad. Polon. Sci. Ser. Sci. Math Astro. Phys. 6 (1958), 429436.Google Scholar
7. Gentry, K. R. and Hoyle, H. B. III, C-continuous functions, Yokohama Math. J. 18 (1970), 7176.Google Scholar
8. Helderman, N. C., The category of D-completely regular spaces is simple, Trans. Amer. Math Soc. 262 (1980), 437446.Google Scholar
9. Helderman, N. C., Develop ability and new separation axioms, Can. J. Math. 33 (1981), 641663.Google Scholar
10. Jones, J. Jr., On semiconnected mappings of topological spaces, Proc. Amer. Math. Soc. 19 (1968), 174175.Google Scholar
11. Kohli, J. K., A class of mappings containing all continuous and all semiconnected mappings, Proc. Amer. Math. Soc. 72 (1978), 175181.Google Scholar
12. Kohli, J. K., Sufficient conditions for continuity of certain connected functions, Glasnik Mat. 15 (1980), 377381.Google Scholar
13. Kohli, J. K., S-continuous functions and certain weak forms of regularity and complete regularity, Math. Nachr. 97 (1980), 189196.Google Scholar
14. Kohli, J. K., S-continuous mappings, certain weak forms of normality and strongly semilocally connected spaces, Math. Nachr. 99 (1980), 6976.Google Scholar
15. Kohli, J. K., A unified approach to continuous and certain non-continuous functions, Symposium General Topology and its Applications, University of Delhi, Delhi (1978).Google Scholar
16. Kohli, J. K., A unified approach to continuous and certain non-continuous functions, characterizations of spaces and product theorems, Seminar on Functional Analysis and General Topology, Gujrat University, Ahmedabad (1981).Google Scholar
17. Kohli, J. K., A decomposition of (complete) regularity in topological spaces (preprint).Google Scholar
18. Livson, B. U., Cardinality and separation axioms, Math. Student 45 (1977), 8891.Google Scholar
19. Long, P. E., Concerning semiconnected mappings, Proc. Amer. Math. Soc. 21 (1969), 117118.Google Scholar
20. Mack, J., Countable paracompactness and weak normality properties, Trans. Amer. Math. Soc 148 (1910), 265272.Google Scholar
21. Mathur, A., δ-continuous functions (preprint).Google Scholar
22. Mrówka, S., Further results on E-compact spaces I, Acta Math. 120 (1968), 161185.Google Scholar
23. Noiri, T., δ-continuous mappings, J. Korean Math. Soc. 16 (1979/80), 161166.Google Scholar
24. Porter, J. R. and Thomas, J., On H-closed and minimal Hausdorff spaces, Trans. Amer. Math Soc. 138 (1969), 159170.Google Scholar
25. Singal, M. K. and Singal, A. R., Almost continuous mappings, Yokohama Math. J. 76 (1968), 6373.Google Scholar
26. Singal, M. K. and Arya, S. P., On almost regular spaces, Glasnik Mat. Ser III 4 (1969), 8999.Google Scholar
27. Singal, M. K. and Arya, S. P., On almost normal and almost completely regular spaces, Glasnik Mat. Ser III 5 (1970), 141152.Google Scholar
28. Singal, M. K. and Mathur, A., A note on almost completely regular spaces, Glasnik Mat. Ser Ill 6 (1971), 345350.Google Scholar
29. Stone, M. H., Applications of the theory of Boolean rings to general topology, Trans. Amer. Math Soc. 41 (1937), 375481.Google Scholar
30. Veličko, N. V., On E-closed spaces, Mat. Sb. 70 (1966), 98112.Google Scholar
31. Whyburn, G. T., Semilocally connected sets, Amer. J. Math. 61 (1939), 733741.Google Scholar
32. Whyburn, G. T., Directed families of sets and closedness of functions, Proc. Nat. Acad. Sci. USA 54 (1965), 688692.Google Scholar
33. Willard, S., General topology (Addison Wesley Reading, Massachusetts, 1970).Google Scholar
34. Younglove, J. N., A locally connected, complete Moore space on which every real-valued continuous function is constant, Proc. Amer. Math. Soc. 20 (1969), 527530.Google Scholar
35. Zaičev, V., Some classes of topological spaces and their bicompactifications, Soviet Math. Dokl 9 (1968), 192193.Google Scholar