TY - JOUR
T1 - Steiner quadruple systems with point-regular abelian automorphism groups
AU - Munemasa, Akihiro
AU - Sawa, Masanori
PY - 2012/3/1
Y1 - 2012/3/1
N2 - In this article we present a graph theoretic construction of Steiner quadruple systems (SQS) admitting Abelian groups as point-regular automorphism groups. The resulting SQS has an extra property that we call A-reversibility, where A is the underlying Abelian group. In particular, when A is a 2-group of exponent at most 4, it is shown that an A-reversible SQS always exists. When the Sylow 2-subgroup of A is cyclic, we give a necessary and sufficient condition for the existence of an A-reversible SQS, which is a generalization of a necessary and sufficient condition for the existence of a dihedral SQS by Piotrowski (1985). This enables one to construct A-reversible SQS for any Abelian group A of order v such that for every prime divisor p of v there exists a dihedral SQS(2p).
AB - In this article we present a graph theoretic construction of Steiner quadruple systems (SQS) admitting Abelian groups as point-regular automorphism groups. The resulting SQS has an extra property that we call A-reversibility, where A is the underlying Abelian group. In particular, when A is a 2-group of exponent at most 4, it is shown that an A-reversible SQS always exists. When the Sylow 2-subgroup of A is cyclic, we give a necessary and sufficient condition for the existence of an A-reversible SQS, which is a generalization of a necessary and sufficient condition for the existence of a dihedral SQS by Piotrowski (1985). This enables one to construct A-reversible SQS for any Abelian group A of order v such that for every prime divisor p of v there exists a dihedral SQS(2p).
KW - Combinatorial design
KW - Finite group
KW - Graph
KW - Steiner system
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U2 - 10.1080/15598608.2012.647536
DO - 10.1080/15598608.2012.647536
M3 - Article
AN - SCOPUS:84860806960
SN - 1559-8608
VL - 6
SP - 97
EP - 128
JO - Journal of Statistical Theory and Practice
JF - Journal of Statistical Theory and Practice
IS - 1
ER -