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JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive

Izv. Vyssh. Uchebn. Zaved. Mat., 2010 Number 5, Pages 41–54 (Mi ivm6735)

This article is cited in 2 papers

A generalization of the Helly theorem for functions with values in a uniform space

Yu. V. Tret'yachenko

Chair of Applied Mathematics and Information Science, State University of Higher School of Economics in Nizhni Novgorod, Nizhni Novgorod, Russia

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.

UDC: 515.123+517.52.2+517.51

Received: 07.04.2008


 English version:
Russian Mathematics (Izvestiya VUZ. Matematika), 2010, 54:5, 35–46

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