Dikranjan, DikranGiordano Bruno, Anna2017-09-062017-09-062009-04-011576-9402https://riunet.upv.es/handle/10251/86552[EN] Semitopological isomorphisms of topological groups were introduced by Arnautov [2], who posed several questions related to compositions of semitopological isomorphisms and about the groups G (we call them Arnautov groups) such that for every group topology on G every semitopological isomorphism with domain (G, ) is necessarily open (i.e., a topological isomorphism). We propose a different approach to these problems by introducing appropriate new notions, necessary for a deeper understanding of Arnautov groups. This allows us to find some partial answers and many examples. In particular, we discuss the relation with minimal groups and non-topologizable groups.Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)Minimal groupA-complete topologyHeisenberg groupMarkov groupOpen mapping theoremPermutations groupSemitopological isomorphismTaımanov topologyTopologizable groupArtículo2017-09-0610.4995/agt.2009.1789Abierto1989-4147