Extendable Steiner designs
β Scribed by J. D. Key
- Book ID
- 104653793
- Publisher
- Springer
- Year
- 1992
- Tongue
- English
- Weight
- 225 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0046-5755
No coin nor oath required. For personal study only.
β¦ Synopsis
Let ~ be a Steiner t-design, where t ~> 2, with a collection C of subdesigns such that each member of C is a Steiner t-design whose blocks are blocks of ~, and with the property that any (t + 1) points of ~ are together in the point set of a unique member of C. It is shown that if every member of C can be extended to a (t + 1)-design, then ~ can also be extended.
The construction described is a development of ideas originally formulated in Assmus and Key [23.
π SIMILAR VOLUMES
Necessary and sufficient conditions for the extendability of residual designs of Steiner systems S ( t , t + 1, v) are studied. In particular, it is shown that a residual design with respect to a single point is uniquely extendable, and the extendability of a residual design with respect to a pair o
## Abstract Hitherto, all known nonβtrivial Steiner systems __S__(5, __k, v__) have, as a group of automorphisms, either __PSL__(2, __v__β1) or __PGL__(2, (__v__β2)/2) Γ __C__~2~. In this article, systems __S__(5, 6, 72), __S__(5, 6, 84) and __S__(5, 6, 108) are constructed that have only the trivi
In this article, direct and recursive constructions for a cyclically resolvable cyclic Steiner 2-design are given.