The universality of Hughes-free division rings

نویسندگان

چکیده

Abstract Let $$E*G$$ E ∗ G be a crossed product of division ring E and locally indicable group G . Hughes showed that up to -isomorphism, there exists at most one Hughes-free -ring. However, the existence -ring $${\mathcal {D}}_{E*G}$$ D for an arbitrary is still open question. Nevertheless, exists, example, if amenable or bi-orderable. In this paper we study, whether universal fractions in some these cases. particular, show residually-(locally amenable) group, then {D}}_{E[G]}$$ [ ] it universal. Appendix give description when RFRS group.

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ژورنال

عنوان ژورنال: Selecta Mathematica-new Series

سال: 2021

ISSN: ['1022-1824', '1420-9020']

DOI: https://doi.org/10.1007/s00029-021-00691-w