A mitre in a Steiner triple system is a set of five triples on seven points, in which two are disjoint. Recursive constructions for Steiner triple systems containing no mitre are developed, leading to such anti-mitre systems for at least 9/16 of the admissible orders. Computational results for small cyclic Steiner triple systems are also included.
机构:
Nagoya Univ, Grad Sch Infomat Sci, Chikusa Ku, Nagoya 4648601, Aichi, JapanNagoya Univ, Grad Sch Infomat Sci, Chikusa Ku, Nagoya 4648601, Aichi, Japan