Abstract:
In this paper we consider sequences of functions that are defined on a subset of the real line with values in a uniform Hausdorff space. For such sequences we obtain a sufficient condition for the existence of pointwise convergent subsequences. We prove that this generalization of the Helly theorem includes many results of the recent research. In addition, we prove that the sufficient condition is also necessary for uniformly convergent sequences of functions. We also obtain a representation for regular functions whose values belong to the uniform space.
Keywords:
selection principle, pointwise convergence, proper functions with respect to a dense set, uniform space.
Citation:
Yu. V. Tret'yachenko, “A generalization of the Helly theorem for functions with values in a uniform space”, Izv. Vyssh. Uchebn. Zaved. Mat., 2010, no. 5, 41–54; Russian Math. (Iz. VUZ), 54:5 (2010), 35–46
\Bibitem{Tre10}
\by Yu.~V.~Tret'yachenko
\paper A generalization of the Helly theorem for functions with values in a~uniform space
\jour Izv. Vyssh. Uchebn. Zaved. Mat.
\yr 2010
\issue 5
\pages 41--54
\mathnet{http://mi.mathnet.ru/ivm6735}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=2779772}
\elib{https://elibrary.ru/item.asp?id=13059268}
\transl
\jour Russian Math. (Iz. VUZ)
\yr 2010
\vol 54
\issue 5
\pages 35--46
\crossref{https://doi.org/10.3103/S1066369X10050063}
\scopus{https://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-78649540929}
Linking options:
https://www.mathnet.ru/eng/ivm6735
https://www.mathnet.ru/eng/ivm/y2010/i5/p41
This publication is cited in the following 2 articles:
V. V. Chistyakov, S. A. Chistyakova, “The Approximate Variation of Univariate Uniform Space Valued Functions and Pointwise Selection Principles”, Lobachevskii J Math, 43:3 (2022), 550
Vyacheslav V. Chistyakov, SpringerBriefs in Optimization, From Approximate Variation to Pointwise Selection Principles, 2021, 1