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Displaying similar documents to “The Sorgenfrey plane in dimension theory”

Hausdorff measures and two point set extensions

Jan Dijkstra, Kenneth Kunen, Jan van Mill (1998)

Fundamenta Mathematicae

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We investigate the following question: under which conditions is a σ-compact partial two point set contained in a two point set? We show that no reasonable measure or capacity (when applied to the set itself) can provide a sufficient condition for a compact partial two point set to be extendable to a two point set. On the other hand, we prove that under Martin's Axiom any σ-compact partial two point set such that its square has Hausdorff 1-measure zero is extendable.