线图上泛圈性的两个独立点的度和条件

Degree Sums of Two Independent Vertics Condition for Pancyclicity in Iine Graphs

设G是阶数为n 51的简单连通图,满足周长g(G)4,且2δ(G)(2n-9)/5。若G是哈密顿图,则其线图L(G)是泛圈图。

Let G be a simple connected graph with order n≥51, which satisfies the girth g（G） ≥4 and 82 ≥ （2n -9）/5. If G is Hamihonian, then its line graph L（G） is pancyclic graph.