The spectrum for large sets of pure Mendelsohn triple systems
The spectrum for large sets of pure Mendelsohn triple systems
复制标题
DOI:
10.1016/j.disc.2007.04.033
复制
发表时间:
2008-05
期刊:
影响因子:
--
通讯作者:
Junling Zhou;Yanxun Chang;L. Ji
中科院分区:
文献类型:
--
作者:
Junling Zhou;Yanxun Chang;L. Ji
An LPMTS(v) is a collection of v-2 disjoint pure Mendelsohn triple systems on the same set of v elements. In this paper, the concept of t-purely partitionable Mendelsohn candelabra system (or t-PPMCS in short) is introduced for constructing LPMTS(v)s. A powerful recursive construction for t-PPMCSs is also displayed by utilizing s-fan designs. Together with direct constructions, the existence of an LPMTS(v) for v≡1,9(mod12) and v>1 is established. For odd integer v⩾7, a special construction from both LPMTS(v) and OLPMTS(v) to LPMTS(2v+1) is set up. Finally, the existence of an LPMTS(v) is completely determined to be the set {v:v≡0,1(mod3),v⩾4,v≠6,7}.