We present a new recursive construction for difference matrices whose application allows us to improve some results by D. Jungnickel. For instance, we prove that for any Abelian p-group G of type (n1 , n2 , . . . , nt) there exists a (G, p e , 1) difference matrix with e = Ξ£ i n i m ax i n i . Also,
Cyclotomic constructions of external difference families and disjoint difference families
β Scribed by B. Huang; D. Wu
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 98 KB
- Volume
- 17
- Category
- Article
- ISSN
- 1063-8539
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
External difference families (EDFs) are a type of new combinatorial designs originated from cryptography. Some results had been obtained by Chang and Ding, the connection between EDFs and disjoint difference families (DDFs) was also established. In this paper, further cyclotomic constructions of EDFs and DDFs are presented, and several classes of EDFs and DDFs are obtained. Answers to problems 1 and 4 by Chang and Ding are also given. Β© 2009 Wiley Periodicals, Inc. J Combin Designs 17: 333β341, 2009
π SIMILAR VOLUMES
## Abstract In this article, two constructions of (__v__, (__v__βββ1)/2, (__v__βββ3)/2) difference families are presented. The first construction produces both cyclic and noncyclic difference families, while the second one gives only cyclic difference families. The parameters of the second construc
## Abstract We establish some properties of mixed difference families. We obtain some criteria for the existence of such families and a special kind of multipliers. Several methods are presented for the construction of difference families by using cyclotomy and genetic algorithms. Β© 2004 Wiley Peri
In [2] R. C. Bose gives a sufficient condition for the existence of a (q, 5, 1) difference family in (GF(q), +)-where q = 1 mod 20 is a prime power-with the property that every base block is a coset of the 5th roots of unity. Similarly he gives a sufficient condition for the existence of a (q,4,1) d
## Abstract This article is devoted to an analysis of simple families of finite difference schemes for the wave equation. These families are dependent on several free parameters, and methods for obtaining stability bounds as a function of these parameters are discussed in detail. Access to explicit
## Abstract The existence of a (__q,k__, 1) difference family in __GF__(__q__) has been completely solved for __k__β=β3,4,5,6. For __k__β=β7 only partial results have been given. In this article, we continue the investigation and use Weil's theorem on character sums to show that the necessary condi