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机构地区:[1]军械工程学院基础部,石家庄河北050003 [2]河北师范大学数学研究所,石家庄河北050016
出 处:《数学进展》2009年第1期35-43,共9页Advances in Mathematics(China)
基 金:Supported by the National Natural Science Foundation of China(No.10671055).
摘 要:λK_v为λ重v点完全图,G为有限简单图,λK_v的一个G-设计(G-填充设计,G-覆盖设计),记为(v,G,λ)-GD((v,G,λ)-PD,(v,G,λ)-CD),是指一个序偶(X,B),其中X为K_v的顶点集,B为K_v中同构于G的子图的集合,称为区组集,使得K_v中每条边恰好(至多,至少)出现在B的λ个区组中.一个填充(覆盖)设计称为最大(最小)的,如果没有其它的填充(覆盖)设计有更多(更少)的区组.本文中,我们构作了三个六点七边图的最大填充与最小覆盖.Let λKv be the complete multigraph with v vertices and G a finite simple graph. A G-design ( G-packing design, G-covering design) of λKv, denoted by (v, G, λ)-GD ((v, G, λ)- PD, (v,G,λ)-CD), is a pair (X,B) where X is the vertex set of Kv and B is a collection of subgraphs of Kv, called blocks, such that each block is isomorphic to G and any two distinct vertices in Kv are joined in exactly (at most, at least) λ blocks of B. A packing (covering) design is said to be maximum (minimum) if no other such packing (covering) design has more (fewer) blocks. In this paper, a maximum (v, G, λ)-PD and a minimum (v, G, λ)-CD are constructed for 3 graphs of 6 vertices and 7 edges.
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