Mathematical Notes · 1975 · 22 citations · 4 references
Natural SciencesComputer ScienceMathematicsMachine LearningSet TheoryTopologyApproximation AlgorithmsComputational TopologyConvex AnalysisMetrization TheoremsSet-theoretic TopologyTopological SpacesApproximation PropertiesBest ApproximationConnectivity Algorithms
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M. S. Ramanujan, Helmut Schaefer · American Mathematical Monthly · 1967 · 4K citations
James A. Clarkson · Transactions of the American Mathematical Society · 1936 · 932 citations · Full text
Chebyshev sets and some generalizations of them
L. P. Vlasov · Mathematical Notes · 1968 · 15 citations