染色数为5和6的图中的圈长
Cycle lengths in graphs of chromatic number five and six
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摘要: Moore和West提出问题:每一个(k+1)-临界的非完全图中是否存在一个模k的意义下长度为2的圈.这里证明了更强的结论:对于k=4, 5,每一个(k+1)-临界的非完全图中一定存在模k的意义下所有长度的圈.Abstract: A problem was proposed by Moore and West to determine whether every (k+1)-critical non-complete graph has a cycle of length 2 modulo k. We prove a stronger result that for k=4, 5, every (k+1)-critical non-complete graph contains cycles of all lengths modulo k.
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