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总览 评价 万良霞 * , 刘彦佩 ( 北京交通大学数学系,北京 100044; ) 摘要: 本文提供了两个嵌入的diamond和的不可定向亏格的反例.这表明论文"Orientable and nonorientable genera for some completetripartite graphs"(SIAM J. Discrete Math.18(3) (2
万良霞*, 刘彦佩
(
北京交通大学数学系,北京 100044; )
摘要:
本文提供了两个嵌入的diamond和的不可定向亏格的反例.这表明论文"Orientable and nonorientable genera for some completetripartite graphs"(SIAM J. Discrete Math.18(3) (2004),479-487.) 中的方法不能证明定理3.3(ii-iii).文中给出了此定理某些情形下的证明.
关键词:
组合;联树;关联曲面;完全三部图;不可定向亏格;嵌入
Wan Liangxia*, LIU Yanpei
(
Department of Mathematics, Beijing Jiaotong University, Beijing 100044; )
Abstract:
This paper provides two counterexamples for thenonorientable genus of the diamond sum of two embeddings, whichshows that Theorem 3.3 (ii-iii) can not be proved by the method usedin the paper "Orientable and nonorientable genera for some completetripartite graphs"(SIAM J. Discrete Math.18(3) (2004),479-487.) A new proof of the Theorem is given for certain cases.
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