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Preprint Number 741
741. Jean-Cyrille Massicot (ICJ), Frank Olaf Wagner (ICJ)
Submission date: 23 June 2014.
Given a definably amenable approximate subgroup A of a (local) group in some first-order structure, there is a type-definable subgroup H normalised by A and contained in A^4 such that every definable superset of H has positive measure.
Mathematics Subject Classification:
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