## An automorphism group of a nontrivial (possibly infinite) Steiner triple system has at least as many block-orbits as point-orbits. The proof is a translation of that in the finite case, with a small twist. For block size 4, the argument fails, and, indeed, the stronger statement (involving blo
An extension theorem for Steiner systems
β Scribed by John L. Blanchard
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 453 KB
- Volume
- 141
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
Given a Steiner system S(2,k-1;v) with v>~vo(k), there is a 3-design Sa(3, k;v+ t) such that the derived design is 2 copies of the Steiner system for any 2 sufficiently large satisfying the standard arithmetic conditions. This theorem has applications in the construction of Steiner 3-designs.
π SIMILAR VOLUMES
## Abstract The obvious necessary conditions for the existence of a nested Steiner triple system of order __v__ containing a nested subsystem of order __w__ are __v__ββ₯β3__w__β+β4 and __v__ββ‘βwββ‘β1 (mod 6). We show that these conditions are also sufficient. Β© 2004 Wiley Periodicals, Inc.