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On central extensions and definably compact groups in o-minimal structures

Author:
Hrushovski, Ehud  Peterzil, Ya'acov  Pillay, Anand  


Journal:
JOURNAL OF ALGEBRA


Issue Date:
2011


Abstract(summary):

We prove several structural results on definable, definably compact groups G in o-minimal expansions of real closed fields such as (i) G is definably an almost direct product of a semisimple group and a commutative group, (ii) (G,.) is elementarily equivalent to (G/G(oo),.) We also prove results on the internality of finite covers of G in an o-minimal environment, as well as deducing the full compact domination conjecture for definably compact groups from the semisimple and commutative cases which were already settled. These results depend on key theorems about the interpretability of central and finite extensions of definable groups, in the o-minimal context. These methods and others also yield interpretability results for universal covers of arbitrary definable real Lie groups. (C) 2010 Elsevier Inc. All rights reserved.


Page:
71---106


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