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无三角形的C(l,k)的超欧拉性 被引量:5

On the Supereulerian Nature of Trlangle-Free C(l,k)
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摘要 引入了C(l,k)图类的概念:对于整数k≥0及整数l>0,用C(l,k)表示一类n阶2-边连通图.图G∈C(l,k)当且仅当对于任意的边割集SE(G),|S|≤3,使G-S的任一分支至少有(n-k)/l个顶点.证明了:若无三角形的图G∈C(6,5),则G是超欧拉的当且仅当G不能收缩为几个特殊的图. Graph G is supereulerian, if G has a spanning eulerian subgraph. Let l〉 0 and k ≥0 be two integers. Graph G ∈C(l, k) if and only if G with order n is 2-edge-connected and for every bond S ∩→ E(G) with | S | 3, each component of G-S has order at least (n-k)/l. It is proved that ifG G∈(6, 5) and Gis triangle-free, then G is supereulerian if and only if G can not be contracted to some well classified special graphs.
出处 《西南大学学报(自然科学版)》 CAS CSCD 北大核心 2008年第12期9-12,共4页 Journal of Southwest University(Natural Science Edition)
基金 重庆市自然科学基金资助项目(CSTC 2007BA2024) 重庆市教委资助项目(KJ0707010)
关键词 超欧拉图 可折叠子图 无三角形 简化图 supereulerian graphs collapsible graphs triangle-free reduction
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共引文献14

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