## Abstract In two groups of order 100 new difference sets are constructed. The existence of a difference set in one of them has not been known. The correspondence between a (100, 45, 20) symmetric design having regular automorphism group and a difference set with the same parameters has been used
New partial difference sets in p-groups
β Scribed by Xiang-Dong Hou
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 110 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1063-8539
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
Latin square type partial difference sets (PDS) are known to exist in R Γ R for various abelian pβgroups R and in β€^t^. We construct a family of Latin square type PDS in β€^t^ Γ β€^2__nt__^~p~ using finite commutative chain rings. When t is odd, the ambient group of the PDS is not covered by any previous construction. Β© 2002 Wiley Periodicals, Inc. J Combin Designs 10: 394β402, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/jcd.10029
π SIMILAR VOLUMES
We construct a family of partial difference sets with Denniston parameters in the group Z t 4 Γ Z t 2 by using Galois rings.
We prove that for any primes p 1 ; . . . ; p s there are only finitely many numbers Q s iΒΌ1 p ai i ; a i 2 Z ΓΎ ; which can be orders of dihedral difference sets. We show that, with the possible exception of n ΒΌ 540; 225; there is no difference set of order n with 15n410 6 in any dihedral group.
We generalize a construction of partial di!erence sets (PDS) by Chen, Ray-Chaudhuri, and Xiang through a study of the TeichmuK ller sets of the Galois rings. Let R"GR(p, t) be the Galois ring of characteristic p and rank t with TeichmuK ller set ΒΉ and let : RPR/pR be the natural homomorphism. We giv
Nontrivial difference sets in groups of order a power of 2 are part of the family of difference sets called Hadamard difference sets. In the abelian case, a group of order 2 2 tq2 has a difference set if and only if the exponent of the group is less tq 2 Ε½ than or equal to 2 . In a previous work R.
We consider groups D 2p Γ Z q , with p and q odd primes, q `p, and for which each prime dividing n has order p Γ 1 (mod p). If such a group contains a nontrivial difference set, D, our main theorem gives constraints on the parameters of D. This in turn rules out difference sets in some groups of thi