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The converse Ostrowski theorem

By N. H. Bingham and Adam Ostaszewski

Abstract

The Ostrowski theorem in question is that an additive function bounded (above, say) on a set T of positive measure is continuous. In the converse direction, recall that a topological space T is pseudocompact if every function continuous on T is bounded. Thus theorems of `converse Ostrowski' type relate to `additive (pseudo)compactness'. We give a different characterization of such sets, in terms of the property of `generic subuniversality', arising from the Kestelman-Borwein-Ditor theorem

Topics: H Social Sciences (General)
Publisher: London school of economics & political science
Year: 2007
OAI identifier: oai:eprints.lse.ac.uk:6832
Provided by: LSE Research Online
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