A Schur ring A is called Dedekind if the formal sum of every A-subgroup is in the center of A. In this paper, we find all finite groups G such that every proper Schur ring over G is Dedekind. As a corollary of our main theorem, we find all finite groups G such that every proper Schur ring over G is commutative.
机构:
Univ London Queen Mary & Westfield Coll, Sch Math Sci, London E1 4NS, EnglandUniv London Queen Mary & Westfield Coll, Sch Math Sci, London E1 4NS, England
Wehrfritz, BAF
JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES,
2004,
70
: 325
-
340