设Kr+1是一个r+1个顶点的完全图.一个可图序列π=(d1,d2,…,dn)称为是蕴含Kr+1-可图的,如果π有一个实现包含K(r+1)作为子图.该文进一步研究了蕴含Kr+1-可图序列的一些新的条件,证明了这些条件包含文献[14,10,11]中的一些主要结果和当n≥(5r)/2+1时,σ(K(r+1),n)之值(此值在文献[2]中被猜测,在文献[6,7,8,3]中被证实).此外,确定了所有满足n≥5,d5≥4且不蕴含K5-可图序列π=(d1,d2,…,dn)的集合.
Let K(r+1) be the complete graph on r + 1 vertices.A graphic sequenceπ= (d1,d2,...,dn) is said to be potentially K(r+1)-graphic if there exists a realization ofπcontaining K(r+1) as a subgraph.In this paper,we further investigate a number of new conditions forπto be potentially K(r+1)-graphic,which imply some previous results in and the values ofσ(K(r+1),n) for n≥(5r)/2 + 1,which was conjectured in and was confirmed in. Moreover,we also determine F(4),the set of all graphic sequencesπ=(d1,d2,...,dn)with n ≥5 and d5 ≥ 4 so that π is not potentially K5-graphic.