Edmundo, MárioJones, G. O.Peatfield, N. J.2014-01-262014-01-262011-02Edmundo, Mário; Jones, G. O.; Peatfield, N. J. - Invariance results for definable extensions of groups. "Archive for Mathematical Logic" [Em linha]. ISSN 0933-5846. Vol. 50, nº 1-2 (2011), p. 1-150933-5846http://hdl.handle.net/10400.2/2909We 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.engDefinable groupsO-minimal structuresjournal article