Mathematics – Group Theory
Scientific paper
2010-07-04
Rend. Semin. Mat. Univ. Padova 120 (2008), 79-126
Mathematics
Group Theory
32 pages
Scientific paper
Inspired by an analogous result of Arnautov about isomorphisms, we prove that all continuous surjective homomorphisms of topological groups f:G-->H can be obtained as restrictions of open continuous surjective homomorphisms f':G'-->H, where G is a topological subgroup of G'. In case the topologies on G and H are Hausdorff and H is complete, we characterize continuous surjective homomorphisms f:G-->H when G has to be a dense normal subgroup of G'. We consider the general case when G is requested to be a normal subgroup of G', that is when f is semitopological - Arnautov gave a characterization of semitopological isomorphisms internal to the groups G and H. In the case of homomorphisms we define new properties and consider particular cases in order to give similar internal conditions which are sufficient or necessary for f to be semitopological. Finally we establish a lot of stability properties of the class of all semitopological homomorphisms.
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