The twisted group ring isomorphism problem over fields

Leo Margolis, Ofir Schnabel

Onderzoeksoutput: Articlepeer review

2 Citaten (Scopus)


Similarly to how the classical group ring isomorphism problem asks, for a commutative ring R, which information about a finite group G is encoded in the group ring RG, the twisted group ring isomorphism problem asks which information about G is encoded in all the twisted group rings of G over R.

We investigate this problem over fields. We start with abelian groups and show how the results depend on the characteristic of R. In order to deal with non-abelian groups we construct a generalization of a Schur cover which exists also when R is not an algebraically closed field, but still linearizes all projective representations of a group. We then show that groups from the celebrated example of Everett Dade which have isomorphic group algebras over any field can be distinguished by their twisted group algebras over finite fields.
Originele taal-2English
Pagina's (van-tot)209-242
Aantal pagina's34
TijdschriftIsrael Journal of Mathematics
Nummer van het tijdschrift1
StatusPublished - 1 jul 2020

Bibliografische nota

Funding Information:
We thank Yuval Ginosar for useful discussions.

Publisher Copyright:
© 2020, The Hebrew University of Jerusalem.

Copyright 2021 Elsevier B.V., All rights reserved.


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