Invariance results for definable extensions of groups

Archive for Mathematical Logic 50 (1-2):19-31 (2011)
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Abstract

We show that in an o-minimal expansion of an ordered group finite definable extensions of a definable group which is defined in a reduct are already defined in the reduct. A similar result is proved for finite topological extensions of definable groups defined in o-minimal expansions of the ordered set of real numbers.

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Gareth Jones
Oxford Brookes University