On Upper Dini’s Systems and U.S.C. Functions With Convex Limit Sets

Authors

  • Mirjana Vuković
  • Dušan Holý Department of Physical Engineering of Materials, Faculty of Industrial Technologies in P´uchov, Trenˇc´ın University of Alexander Dubˇcek, P´uchov, Slovak Republic
  • Ladislav Matejička Department of Physical Engineering of Materials, Faculty of Industrial Technologies in P´uchov, Trenˇc´ın University of Alexander Dubˇcek, P´uchov, Slovak Republic

DOI:

https://doi.org/10.5644/SJM.02.2.10

Keywords:

Upper semicontinuous functions, Dini’s systems, Hausdorff metric, convex limit sets

Abstract

We give an answer to the question in [HN] as to which upper Dini's systems of functions induces a Hausdorff metric topology on $U_0(X)$. We show that if $X$ is a locally connected metric space then the Hausdorff metric topology on $U_0(X)$ induces as an upper Dini's system of functions the set of all bounded upper semicontinuous functions vanishing at infinity with convex limit sets.

 

2000 Mathematics Subject Classification. Primary: 54C35; secondary: 54C60

Downloads

Download data is not yet available.

References

[Be1] G. Beer, On Dini‘s theorem and metric on C(X) topologically equivalent to the uniform metric, Proc. Am. Math. Soc., 86 (1982), 75–80.

[Be2] G. Beer, Topologies on Closed and Closed Convex Sets, Kluwer Academic Publisher, 1993.

[Ho] L. Hol´a, ˇ Spaces of densily continuous forms, USCO and minimal USCO maps, SetValued Anal., 2 (2003), 135–151.

[HN] L. Hol´a and T. Neubrunn, ˇ A remark of functions vanishing at infinity, Rad. Mat., 7 (1991), 185-189.

[R] R. Royden, Real Analysis, Macmillan, New York, 1968.

Downloads

Published

12.06.2024

How to Cite

Vuković, M., Holý, D., & Matejička, L. (2024). On Upper Dini’s Systems and U.S.C. Functions With Convex Limit Sets. Sarajevo Journal of Mathematics, 2(2), 231–236. https://doi.org/10.5644/SJM.02.2.10

Issue

Section

Articles