A hybrid triple system of order v and index A, denoted by HTS(v, λ), is a pair (X,B) where X is a v-set and B is a collection of cyclic triples and transitive triples on X, such that every ordered pair of X belon...A hybrid triple system of order v and index A, denoted by HTS(v, λ), is a pair (X,B) where X is a v-set and B is a collection of cyclic triples and transitive triples on X, such that every ordered pair of X belongs to A triples of B. An overlarge set of disjoint HTS(v, λ), denoted by OLHTS(v, λ), is a collection {(Y/{y}, .Ai)}i, such that Y is a (v + 1)-set, each (Y/{y}, Ai) is an HTS(v, λ,) and all Ais form a partition of all cyclic triples and transitive triples on Y. In this paper, we shall discuss the existence problem of OLHTS(v, A) and give the following conclusion: there exists an OLHTS(v, λ) if and only if λ= 1, 2, 4, v = 0, 1 (rood 3) and v ≥ 4.展开更多
基金Supported by the National Natural Science Foundation of China(No.10971051 and 11071056)
文摘A hybrid triple system of order v and index A, denoted by HTS(v, λ), is a pair (X,B) where X is a v-set and B is a collection of cyclic triples and transitive triples on X, such that every ordered pair of X belongs to A triples of B. An overlarge set of disjoint HTS(v, λ), denoted by OLHTS(v, λ), is a collection {(Y/{y}, .Ai)}i, such that Y is a (v + 1)-set, each (Y/{y}, Ai) is an HTS(v, λ,) and all Ais form a partition of all cyclic triples and transitive triples on Y. In this paper, we shall discuss the existence problem of OLHTS(v, A) and give the following conclusion: there exists an OLHTS(v, λ) if and only if λ= 1, 2, 4, v = 0, 1 (rood 3) and v ≥ 4.