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On forms of continuity and cliquishness

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Abstract

We study the notions of continuity and cliquishness of mapsf: (X, T)→(Y,T′) with the help of collections η⊂P(P(Y)) of families such that the conditionKAÄ impliesKÄ for eachÄ∈ η andKY. The article points to far-going similarities between the weak forms of continuity, strong forms of continuity and cliquishness. The present concept unifis various concepts of continuity and cliquishness of maps.

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References

  1. Andrijevic D.,Semi-preopen sets Mat. Vesnik38 (1986).

  2. Baker C.W.,Properties of subweakly continuous functions, Yokohama Math. J.32 (1984), 39–43.

    MATH  MathSciNet  Google Scholar 

  3. Baker C.W.,On super-continuous functions, Bull. Korean Math. Soc.22 (1985), 17–22.

    MATH  MathSciNet  Google Scholar 

  4. Bledsoe W.,Neighborly functions, Proc. Amer. Math. Soc.3 (1952), 114–115.

    Article  MATH  MathSciNet  Google Scholar 

  5. Blumberg H.,New properties of all real functions, Trans. Amer. Math. Soc.24 (1922), 113–123.

    Article  MathSciNet  Google Scholar 

  6. Cameron D.E.,Some maximal topologies which are QHC, Proc. Amer. Math. Soc.75 (1979), 149–156.

    Article  MATH  MathSciNet  Google Scholar 

  7. Crossley S.G., Hildebrand S.K.,Semi-closure, Texas J. Sci.22 (1971), 99–112.

    Google Scholar 

  8. Crossley S.G., Hildebrand S.K.,Semi-topological properties, Fund. Math.74 (1972), 233–254.

    MATH  MathSciNet  Google Scholar 

  9. Ewert J.,On quasi-continuous and cliquish maps with values in uniform spaces, Bull. Acad. Polon. Sci.32 (1984), 81–88.

    MATH  MathSciNet  Google Scholar 

  10. Ewert J.,On barely continuous and cliquish maps, Demonstration Math.17 (1984), 331–338.

    MATH  MathSciNet  Google Scholar 

  11. Ewert J.,Weak forms of continuity, quasi-continuity and cliquishness of maps with respect to two topologies, Glasnik Mat.21 (1986), 179–189.

    MathSciNet  Google Scholar 

  12. Ewert J., Lipinski J.S.,On points of continuity, quasi-continuity and cliquishness of maps, Colloq. Math. Soc. Janos Bolyai 41. Topology and Appl. Enger (1983), 269–281.

    MathSciNet  Google Scholar 

  13. Ewert J., Lipinski J.S.,On relation between continuity, quasi-continuity and clishness of maps, Proc. Sixth Prague Topological Symposium (1986), Copyright Heldermann Verlag Berlin (1988), 177–185.

    Google Scholar 

  14. Fomin S.,Extensions of topological spaces, Ann. Math.44 (1943), 471–480.

    Article  Google Scholar 

  15. Frolik Z.,Baire spaces and some generalizations of complete metric spaces, Czech. Math. J.86 (1961), 237–248.

    MathSciNet  Google Scholar 

  16. Fudali L.A.,On cliquish functions on product spaces, Math. Slovaca33 (1983), 53–58.

    MATH  MathSciNet  Google Scholar 

  17. Gentry K.R., Hoyle H.B.,T i-continuous functions and separation axioms, Glasnik Mat.17 (1982), 139–141.

    MathSciNet  Google Scholar 

  18. Husain T.,Almost continuous mappings, Prace Mat.10 (1966), 1–7.

    MATH  MathSciNet  Google Scholar 

  19. Jankovic D.S.,θ-regular spaces, Internat. J. Math. Math. Sci.8 (1985), 615–619.

    Article  MATH  MathSciNet  Google Scholar 

  20. Kempisty S.,Sur le fonctions quasicontinues, Fund. Math.19 (1932), 184–197.

    MATH  Google Scholar 

  21. Levine N.,Semi-open setsand semi-continuity in topological spaces, Amer. Math. Monthly70 (1963), 36–41.

    Article  MATH  MathSciNet  Google Scholar 

  22. Levine N.,decomposition of continuity in topological spaces, Amer. Math. Monthly68 (1961), 44–46.

    Article  MATH  MathSciNet  Google Scholar 

  23. Lin Shwn Yeng T., Lin You Feng,On almost continuous mappings and Baire spaces, Canad. Math. Bull.21 (1978), 183–186.

    MathSciNet  Google Scholar 

  24. Lipinski J.S., Salat T.,On the points of quasicontinuity and cliquishness of functions, Czech. Math. J.21 (1971), 484–489.

    MathSciNet  Google Scholar 

  25. Long P.E., Herpington L.L.,The T θ-topology and faintly continuous functions. Kyungpook Math. J.22 (1982), 7–14.

    MATH  MathSciNet  Google Scholar 

  26. Long P.E., Herpington L.L.,Strongly θ-continuous functions, J. Korean Math. Soc.18 (1981), 21–28.

    MATH  MathSciNet  Google Scholar 

  27. Long P.E., McGehee Jr.E.E.,Properties of almost continuous functions, Proc. Amer. Math. Soc.24 (1970), 175–180.

    Article  MATH  MathSciNet  Google Scholar 

  28. Mahashwari S.N., Prasad R.,Some new separation axioms, Ann. Soc. Sci. Bruxelles89 (1975), 395–402.

    Google Scholar 

  29. Mashhour A.S., El-Monsef M.E., El-Deep S.N.,On precontinuous and weak precontinuous mappings, Proc. Math. Soc. Egypt51 (1981).

  30. Mashhour A.S., Abb El-Mansef M., Husain J.A.,On pretopological spaces, Bull. Math. Soc. Sci. Math. Soc. Sci. Math. R.S.R.,28 (1984), 39–45.

    Google Scholar 

  31. Abd El-Monsef M.E., El-Deeb S.N., Mahnoud R.A.,β-open sets and β-continuous mapping, Bull. Fac. Sci. Assiut,12 (1983), 77–99.

    Google Scholar 

  32. Munshi B.M., Bassan D.S.,Super-continuous mappings, Indian J. Pure Appl. Math.,13 (1982), 229–236.

    MATH  MathSciNet  Google Scholar 

  33. Neubrunnova A.,On certain generalizations of notion of continuity, Mat. Casopis23 (1973), 374–380.

    MathSciNet  Google Scholar 

  34. Neubrunnova A.,On quasi-continuous and cliquish functions, Casopis Pest. Mat.,99 (1974), 109–114.

    MathSciNet  Google Scholar 

  35. Neubrunn T., Salat T.,Some generalization, of the notion of continuity and Blumberg sets of functions, Rev. Roumaine Math. Pures Appl.33 (1988), 429–438.

    MATH  MathSciNet  Google Scholar 

  36. Njastad O.,On classes of nearly open sets, Pacific J. Math.,15 (1965), 961–970.

    MATH  MathSciNet  Google Scholar 

  37. Noiri T.,On semi-continuous mappings, Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur.,54 (1973), 210–214.

    MATH  MathSciNet  Google Scholar 

  38. Noiri T.,On δ-continuous functions, J. Korean Math. Soc.,16 (1980), 161–168.

    MATH  MathSciNet  Google Scholar 

  39. Noiri T., Kang S.M.,On almost strongly θ-continuous functions, Indian J. Pure Appl. Math.15 (1984), 1–8.

    MATH  MathSciNet  Google Scholar 

  40. Michael E., Namioka I.,Barely continuous functions, Bull. Acad. Polon. Sci.24 (1976), 889–892.

    MATH  MathSciNet  Google Scholar 

  41. Park K.,On nearly-compact spaces via graphs and projections, Univ. Ulsan Rep. Natur. Sci. Eugry,17 (1986), 197–201.

    MATH  Google Scholar 

  42. Piotrowski Z.,A survey of results concerning generalized continuity on topological spaces, preprint.

  43. Popa V., Stan C.,On a decomposition of quasi-continuity in topological spaces, Stud. Cerc. Mat.,25 (1973), 41–43.

    MATH  MathSciNet  Google Scholar 

  44. Porter J., Thomas J.,On H-closed and minimal hausdorff spaces, Trans. Amer. Math. Soc.138 (1969), 189–170.

    Article  MathSciNet  Google Scholar 

  45. Przemski M.,Nearly T i-continuous functions and some separation axioms, Glasnik Mat.21 (1986), 431–435.

    MathSciNet  Google Scholar 

  46. Przemski M.,On T i-cliquish functions, Demonstratio Math.20 (1987), 537–545.

    MathSciNet  Google Scholar 

  47. Przemski M.,Some generalizations of continuity and quasi-continuity of maps, Mat. Vesnik40 (1988), 69–79.

    MATH  MathSciNet  Google Scholar 

  48. Przemski M.,On feeble T 1-continuity and feeble T1-cliquishness of multivalued maps, Comment. Math.28 (1989), 331–344.

    MATH  MathSciNet  Google Scholar 

  49. Reilly J.L., Vamanamurthy M.K.,On semicompact spaces, Bull. Malaysian Math. Soc.7 (1984), 61–67.

    MATH  MathSciNet  Google Scholar 

  50. Reilly I.Z., Vamanamurthy M.K.,On α-continuity in topological spaces. University of Auckland Report Series193 (1982).

  51. Singal M.K., Singal A.R.,Almost continuous mappings, Yokohama Math. J.16 (1966), 63–73.

    MathSciNet  Google Scholar 

  52. Singal M.K., Aria S.P.,On almost-regular spaces, Glasnik Mat.4 (1969), 89–99.

    Google Scholar 

  53. Thompson T.,S-closed spaces, Proc. Amer. Math. Soc.60 (1976), 335–338.

    Article  MathSciNet  Google Scholar 

  54. Thielman S.P.,Types of functions, Amer. Math. Monthly60 (1953), 156–161.

    Article  MATH  MathSciNet  Google Scholar 

  55. Velicko N.V.,H-closed topological spaces, Amer. Math. Soc. Transl.78 (1968), 103–118.

    Google Scholar 

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Przemski, M. On forms of continuity and cliquishness. Rend. Circ. Mat. Palermo 42, 417–452 (1993). https://doi.org/10.1007/BF02844632

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