Preservation of approximative properties of Chebyshev sets and suns in a planeстатья
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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация:Approximative properties of intersections of suns and Chebyshev sets in a two-dimensional Banach space X 2 with subsets of R2 are studied. Subsets of R2 whose intersections with suns from X 2 are suns are characterized. A similar problem for Chebyshev sets in X_2 is studied.