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arXiv 0906.2496math.GR
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关于Leighton图覆盖定理

On Leighton's graph covering theorem

Walter D. Neumann

摘要:

在有色图的背景下,我们给出了Leighton的证明和Leighton的图覆盖定理的Bass-Kulkarni证明。我们讨论了一个进一步的推广,需要在其他地方,“限制图。我们可以在某些情况下证明它,例如,如果“颜色图”是一棵树,但我们不知道它是否在一般情况下是正确的。我们表明,巴斯的共轭定理,这是一个工具,在巴斯-Kulkarni的方法,并持有在有限的上下文中。

英文摘要:

We give short expositions of both Leighton's proof and the Bass-Kulkarni proof of Leighton's graph covering theorem, in the context of colored graphs. We discuss a further generalization, needed elsewhere, to "symmetry-restricted graphs." We can prove it in some cases, for example, if the "graph of colors" is a tree, but we do not know if it is true in general. We show that Bass's Conjugation Theorem, which is a tool in the Bass-Kulkarni approach, does hold in the symmetry-restricted context.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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