一个小图与路和圈的联图的交叉数

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图的交叉数问题是拓扑图论中的前沿难题.目前关于阶数较少的图与路,圈联图的交叉数的结果较少.证明了一个小图H与n个孤立点的联图的交叉数是cr(H+nK1)=Z(6,n)+2「n/2」;与路Pn的联图的交叉数是cr(H+ Pn)=Z(6,n)+2[n/2」及与圈Cn的联图的交叉数是cr(H+ Cn)=Z(6,n)+2「n/2」+2.
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