Skip to main content
Log in

On abstract and almost-abstract density topologies

  • Published:
Acta Mathematica Hungarica Aims and scope Submit manuscript

Abstract

We concentrate on topologies generated by lower and almost-lower density operators on measurable spaces. Among others the existence of the smallest in the sense of inclusion abstract density topology on measurable space is investigated. Moreover, the separation axioms for such topologies are studied.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. A. M. Bruckner, Differentiation of Real Functions, Lecture Notes in Mathematics 659, Springer-Verlag (Berlin, 1978).

  2. A. Bartoszewicz and K. Ciesielski, MB-representations and topological algebras, Real Anal. Exchange, 27 (2001/2020), 749–756.

  3. Filipczak M.: Ψ-density topology is not regular. Bull. Soc. Sci. Lett. Łódź LIV, 21–25 (2004)

    MathSciNet  MATH  Google Scholar 

  4. Hashimoto H.: On the *-topology and its application. Fund. Math., 91, 5–10 (1976)

    Article  MathSciNet  MATH  Google Scholar 

  5. Haupt O., Pauc C.: La topologie de Denjoy envisagée comme vraie topologie. C. R. Acad. Sci. Paris 234, 390–392 (1952)

    MathSciNet  MATH  Google Scholar 

  6. Hejduk J.: One more difference between measure and category. Tatra Mt. Math. Publ., 49, 9–15 (2011)

    MathSciNet  MATH  Google Scholar 

  7. Hejduk J.: On the regularity of topologies in the family of sets having the Baire property. Filomat 27, 1291–1295 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  8. J. Hejduk and G. Horbaczewska, On I-density topologies with respect to a fixed sequence, in: Reports on Real Analysis, Conference at Rowy (2003), pp. 78–85.

  9. Hejduk J., Loranty A.: On the lower and semi-lower density operator. Georgian Math. J., 14, 661–671 (2007)

    MathSciNet  MATH  Google Scholar 

  10. J. Hejduk and R. Wiertelak, On the abstract of density topologies generated by lower and almost lower density operators, in: Traditional and Present-day Topics in Real Analysis, University of Łódź (2013), pp. 431–440.

  11. Hejduk J., Wiertelak R.: On the generalization of the density topology on the real line. Math. Slovaca 64, 1267–1276 (2014)

    Article  MathSciNet  MATH  Google Scholar 

  12. Hejduk J., Wiertelak R., Wojdowski W.: on semiregularization of some abstract density topologies involving sets having the Baire property. Tatra Mt. Math. Publ., 65, 37–48 (2016)

    MathSciNet  MATH  Google Scholar 

  13. Horbaczewska G.: On topologies connected with Hausdorff measures. Real Anal. Exchange 33, 151–159 (2008)

    Article  MathSciNet  MATH  Google Scholar 

  14. K. Kuratowski, Wstęp do teorii mnogości i topologii, PWN (Warszawa, 1972) (in Polish).

  15. A. Loranty, Separation axioms of the density type topologies, in: Reports on Real Analysis, Conference at Rowy (2003), pp. 119–128.

  16. J. Lukeš, J. Maly̌ and L. Zajiček, Fine Topology Methods in Real Analysis and Potential Theory, Lecture Notes in Math. 1189, Springer-Verlag (Berlin, 1986).

  17. J. Oxtoby, Measure and Category, Springer-Verlag (New York, 1987).

  18. Poreda W., Wagner-Bojakowska E., Wilczyński W.: A category analogue of the density topology. Fund. Math., 125, 167–173 (1985)

    Article  MathSciNet  MATH  Google Scholar 

  19. Terepeta M., Wagner-Bojakowska E.: ψ-density topology. Rend. Circ. Mat. Palermo 48, 451–476 (1999)

    Article  MathSciNet  MATH  Google Scholar 

  20. R.Wiertelak, A generalization of density topology with respect to category, Real Anal. Exchange, 32 (2006/2007), 273–285.

  21. W. Wilczyński, Density topologies, Chapter 15 in Handbook of Measure Theory, Ed. E. Pap, Elsevier (2002), pp. 675–702.

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to A. Loranty.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Hejduk, J., Loranty, A. On abstract and almost-abstract density topologies. Acta Math. Hungar. 155, 228–240 (2018). https://doi.org/10.1007/s10474-018-0838-3

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10474-018-0838-3

Key words and phrases

Mathematics Subject Classification

Navigation