On Upper Dini’s Systems and U.S.C. Functions With Convex Limit Sets
DOI:
https://doi.org/10.5644/SJM.02.2.10Keywords:
Upper semicontinuous functions, Dini’s systems, Hausdorff metric, convex limit setsAbstract
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
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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.