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有向三元系超大集的存在谱

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摘要 一个v阶有向三元系,记为DTS(v,λ),是指一个对子(X,B),这里X为v元集,B为X上一些可迁三元组(简称区组)构成的集合,使得X上每个由不同元素组成的有序对都恰在B的λ个区组中出现.一个有向三元系的超大集,记为OLDTS(v,λ),是指一个集合(Y\{y},A_i)_i,其中Y为v+1元集,每个(Y\{y},A_i)是一个DTS(v,λ),并且所有A_i形成Y上全部可迁三元组的分拆.讨论OLDTS(v,λ)的存在性问题,并且给出结论:存在OLDTS(v,λ)当且仅当λ=1且v≡0,1(mod 3),或λ=3且v≠2.
出处 《中国科学(A辑)》 CSCD 北大核心 2007年第6期660-672,共13页 Science in China(Series A)
基金 国家自然科学基金(批准号:10671055) 国家自然科学天元数学基金(批准号:10526032) 江苏省高校自然科学基金(批准号:05KJB110111) 河北师范大学博士基金
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参考文献13

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