Contractible edges and bowties in a k-connected graph

被引:0
|
作者
Ando, K
Kaneko, A
Kawarabayashi, K
Yoshiomoto, K
机构
[1] Univ Electrocommun, Dept Informat & Commun Engn, Chofu, Tokyo 1828585, Japan
[2] Kogakuin Univ, Dept Comp Sci & Commun Engn, Shinjuku Ku, Tokyo 1638677, Japan
[3] Keio Univ, Dept Math, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
[4] Nihon Univ, Coll Sci & Technol, Dept Math, Chiyoda Ku, Tokyo 1018308, Japan
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D O I
暂无
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Let G be a k-connected graph and let F be the simple graph obtained from G by removing the edge xy and identifying x and y in such a way that the resulting vertex is incident to all those edges (other than xy) which are originally incident to x or y. We say that e is contractible if F is k-connected. A bowtie is the graph consisting of two triangles with exactly one vertex in common. We prove that if a k-connected graph G (k greater than or equal to 4) has no contractible edge, then there exists a bowtie in G.
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收藏
页码:239 / 247
页数:9
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