3 papers
math.RA2025
Twisted group ring isomorphism problem
Leo Margolis, Ofir Schnabel
We propose and study a variation of the classical isomorphism problem for group rings in the context of projective representations. We formulate several weaker conditions following…
math.RA2024
Units of twisted group rings and their correlations to classical group rings
Geoffrey Janssens, Eric Jespers, Ofir Schnabel
This paper is centered around the classical problem of extracting properties of a finite group from the ring isomorphism class of its integral group ring . This p…
math.RA2024
Graded relations on crossed products
Ofir Schnabel
We classify crossed product gradings for arbitrary groups and fields up to several equivalence relations in terms of group actions and their orbits.