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math.RA2007
A twisted Laurent series ring that is a noncrossed product
Timo Hanke
The striking results on noncrossed products were their existence (Amitsur) and the determination of Q(t) and Q((t)) as their smallest possible centres (Brussel). This paper gives t…
math.RA2007
The isomorphism problem for cyclic algebras and its application
Timo Hanke
The isomorphism problem means to decide if two given finite-dimensional simple algebras over the same centre are isomorphic and, if so, to construct an isomorphism between them. A…