## Abstract Two types of large sets of coverings were introduced by T. Etzion (J Combin Designs, 2(1994), 359β374). What is maximum number (denoted by Ξ»(__n,k__)) of disjoint optimal (__n,k,k__βββ1) coverings? What is the minimum number (denoted by Β΅(__n,k__)) of disjoint optimal (__n,k,k__βββ1) co
Large sets of coverings
β Scribed by Tuvi Etzion
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 699 KB
- Volume
- 2
- Category
- Article
- ISSN
- 1063-8539
No coin nor oath required. For personal study only.
β¦ Synopsis
Large sets of packings were investigated extensively. Much less is known about the dual problem, Le., large sets of coverings. We examine two types of important questions in this context; what is the maximum number of disjoint optimal coverings? and what is the minimum number of optimal coverings for which the union covers the space? We give various constructions which give the optimal solutions and some good upper and lower bounds on both questions, respectively. 0 1994 John Wiley & Sons, Inc.
1 ( : ) / M I and M is the size of an optimal (n, k, t ) packing.
π SIMILAR VOLUMES
The minimum number of k-subsets out of a v-set such that each t-set is contained in at least one k-set is denoted by C(v, k, t). In this article, a computer search for finding good such covering designs, leading to new upper bounds on C(v, k, t), is considered. The search is facilitated by predeterm
In this paper we study a notion of a ΞΊ-covering set in connection with Bernstein sets and other types of nonmeasurability. Our results correspond to those obtained by Muthuvel in [7] and Nowik in [8]. We consider also other types of coverings.
## Abstract A heuristic solution procedure for set covering is presented that works well for large, relatively dense problems. In addition, a confidence interval is established about the unknown global optimum. Results are presented for 30 large randomly generated problems.