The last twenty orders of (1, 2)-resolvable Steiner quadruple systems

The last twenty orders of (1, 2)-resolvable Steiner quadruple systems
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DOI:
10.1016/j.disc.2012.08.011
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发表时间:
2012-12
期刊:
Discret. Math.
影响因子:
--
通讯作者:
Zhaoping Meng;B. Du
Zhaoping Meng;B. Du
中科院分区:
其他
文献类型:
--
作者:
Zhaoping Meng;B. Du

文献摘要

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一个Steiner四元组系统(X,B)称为(1,2)-可分解的,如果它的块可以划分成r个部分,使得X的每个点恰好出现在每个部分的两个块中。(1,2)-可分解Steiner四元系RSQS(1,2,v)s存在的必要条件是v ≠ 2或10(mod 12). Hartman和Phelps在[A. Hartman,K.T. Phelps,Steiner quadruple systems,in:J.H. D.R.迪尼茨Stinson(Eds.),当代设计理论,Wiley,纽约,1992年,pp. 205 - 240]提出了一个问题,即(1,2)-可分解Steiner四元系存在的必要条件是否充分。本文研究了后20阶(1,2)-可分解Steiner四元系,证明了除10阶外,(1,2)-可分解Steiner四元系存在的必要条件也是充分的.
A Steiner quadruple system (X,B) is said to be (1,2)-resolvable if its blocks can be partitioned into r parts such that each point of X occurs in exactly two blocks in each part. The necessary condition for the existence of (1,2)-resolvable Steiner quadruple systems RSQS(1,2,v)s is v≡2 or 10 (mod 12). Hartman and Phelps in [A. Hartman, K.T. Phelps, Steiner quadruple systems, in: J.H. Dinitz, D.R. Stinson (Eds.), Contemporary Design Theory, Wiley, New York, 1992, pp. 205–240] posed a question whether the necessary condition for the existence of (1,2)-resolvable Steiner quadruple systems is sufficient. In this paper, we consider the last twenty orders of (1,2)-resolvable Steiner quadruple systems and show that the necessary condition for the existence of (1,2)-resolvable Steiner quadruple systems is also sufficient except for the order 10.