Class I graphs of nonnegative characteristic without special cycles |
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| Authors: | Dan-jun Huang Wei-fan Wang |
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| Institution: | 1. Department of Mathematics, Zhejiang Normal University, Jinhua, 321004, China
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| Abstract: | In this paper, we prove that every graph with maximum degree six that can be embedded in a surface of nonnegative characteristic is of Class I if it does not contain a 5- or 6-cycle with a chord, which extends some known results. |
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| Keywords: | graph Class I characteristic cycle |
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