We generalize some existence theorems for t- (u,k,l) designs. In fact, we prove that if certain inequality holds involving parameters of some simple r-designs, then new simple t-designs can be constructed. Using these results we discover first examples of infinite families of 5-designs in which blo
An existence theorem for some simple t-designs
β Scribed by Michel Dehon
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 314 KB
- Volume
- 90
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
Dehon, M., An existence theorem for some simple t-designs, Discrete Mathematics 90 (1991) 137-142.
Let S' be a simple S;(t, k, [) containing
b' blocks and let S be a, not necessarily simple, $(t, 1. u); we prove that if b"(A -1) < (:), then there exists a simple &,(t, k, v). We apply this result to prove the existence of a new infinite family of 5-designs derived from the Alltop's family of 5-designs.
π SIMILAR VOLUMES
The following result gives a partial answer to a question of R. M. Wilson regarding the existence of group divisible designs of large order. Let k and u be positive integers, 2 [ k [ u. Then there exists an integer m 0 =m 0 (k, u) such that there exists a group divisible design of group type m u wit