Skip to main content
Log in

Quasicontinuous Subcontinuous Functions and Compactness

  • Published:
Mediterranean Journal of Mathematics Aims and scope Submit manuscript

Abstract

Let X be a locally compact space and (Y, d) be a metric space. A subfamily \({\mathcal E}\) of the space of quasicontinuous subcontinuous functions from X to Y is compact in this space equipped with the topology of uniform convergence on compact sets if and only if \({\mathcal E}\) is closed, compactly bounded and densely equiquasicontinuous. This result is a new version of Ascoli-type theorem for quasicontinuous subcontinuous functions.

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. Baire R.: Sur les functions des variables reelles. Ann. Mat. Pura Appl. 3, 1–122 (1899)

    Article  MATH  Google Scholar 

  2. Bouziad A.: Every Čech-analytic Baire semitopological group is a topological group. Proc. Am. Math. Soc. 124, 953–959 (1996)

    Article  MathSciNet  MATH  Google Scholar 

  3. Borwein, J.M.: Minimal cuscos and subgradients of Lipschitz functions. In: In Fixed point theory and applications (Marseille, 1989), Pitman Res. Notes Math. Ser., vol. 252, pp. 57–81. Longman Sci. Tech., Harlow (1991)

  4. Fuller R.V.: Sets of points of discontinuity. Proc. Am. Math. Soc 38, 193–197 (1973)

    Article  MathSciNet  Google Scholar 

  5. Goel A., Garg G.L.: Convergence conditions and closed graphs. Soochov J. Math. 33, 257–261 (2007)

    MathSciNet  MATH  Google Scholar 

  6. Holá Ľ., Holý D.: Minimal usco maps, densely continuous forms and upper semicontinuous functions. Rocky Mt. Math. J. 39, 545–562 (2009)

    Article  MATH  Google Scholar 

  7. Holá Ľ., Holý D.: Pointwise convergence of quasicontinuous mappings and Baire spaces. Rocky Mt. Math. J. 41, 1883–1894 (2011)

    Article  MathSciNet  MATH  Google Scholar 

  8. Holá Ľ., Holý D.: New characterization of minimal CUSCO maps. Rocky Mt. Math. J. 44, 1851–1866 (2014)

    Article  MATH  Google Scholar 

  9. Holý, D.: Ascoli-type theorems for locally bounded quasicontinuous functions, minimal usco and minimal cusco maps. Ann. Funct. Anal. 6(3), 29–41 (2015). http://projecteuclid.org/afa

  10. Holá Ľ.: Functional characterization of p-spaces. Central Eur. J. Math. 11, 2197–2202 (2013)

    MATH  Google Scholar 

  11. Holá Ľ., Novotný B.: Subcontinuity. Math. Slovaca 62, 1–18 (2012)

    Article  MathSciNet  MATH  Google Scholar 

  12. Hrycay R.: Noncontinuous multifunctions. Pac. J. Math. 35, 141–154 (1970)

    Article  MathSciNet  MATH  Google Scholar 

  13. Kelley, J.L.: General Topology. Van Nostrand, New York (1955)

  14. Kempisty S.: Sur les fonctions quasi-continues. Fundam. Math. 19, 184–197 (1932)

    MATH  Google Scholar 

  15. Kenderov, P.S., Kortezov, I.S., Moors, W.B.: Continuity points of quasi-continuous mappings. Topology Appl. 109, 321–346 (2001)

  16. Lechicki A., Levi S.: Extensions of semicontinuous multifunctions. Forum Math. 2, 341–360 (1990)

    Article  MathSciNet  MATH  Google Scholar 

  17. Michael E.: Topologies on spaces of subsets. Trans. Am. Math. Soc. 71, 152–182 (1951)

    Article  MathSciNet  MATH  Google Scholar 

  18. Neubrunn T.: Quasi-continuity. Real Anal. Exchange 14, 259–306 (1988)

    MathSciNet  MATH  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Ľubica Holá.

Additional information

This work was completed with the support of our \({\hbox{\TeX}}\)-pert.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Holá, Ľ., Holý, D. Quasicontinuous Subcontinuous Functions and Compactness. Mediterr. J. Math. 13, 4509–4518 (2016). https://doi.org/10.1007/s00009-016-0759-8

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00009-016-0759-8

Mathematics Subject Classification

Keywords

Navigation