Difference Sets Disjoint from a Subgroup III: The Skew Relative Cases

被引:0
作者
Anderson, Gradin [1 ]
Haviland, Andrew [1 ]
Holmes, Mckay [1 ]
Humphries, Stephen P. [1 ]
Magland, Bonnie [1 ]
机构
[1] Brigham Young Univ, Dept Math, Provo, UT 84602 USA
关键词
Difference set; Subgroup; Hadamard difference set; Schur ring; Dicyclic group;
D O I
10.1007/s00373-023-02662-8
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We study finite groups G having a subgroup H and D subset of G\H such that (i) the multiset {xy(-1) : x, y is an element of D} has every element that is not in H occur the same number of times (such a D is called a relative difference set); (ii) G = D. D(-1). H; (iii) D boolean AND D(-1) = empty set. We show that vertical bar H vertical bar = 2, that H is central and that G is a group with a single involution. We also show that G cannot be abelian. We give infinitely many examples of such groups, including certain dicyclic groups, by using results of Schmidt and Ito.
引用
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页数:20
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