arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1408.5873math.CO
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有限图的S-单位差图表示

Representation of finite graphs as difference graphs of S-units, I

K. Győry, L. Hajdu, R. Tijdeman

摘要:

设G是一个简单的有限图,每个顶点都有一个整数值,不同的顶点有不同的值。设S是有限非空集素数集。我们称G为S-图,如果任意两个顶点由一条边连接当且仅当它们的值相差一个由素数组成的数。例如,我们证明了对于每个G,存在无穷多个有限集S,使得G是S-图。我们研究了圈和完全二部图G.我们考虑G中的三角形进行更深入的分析。最后证明了G是S-图当且仅当G是立方图。除了组合和数论的论点,一些深丢番图的结果有关的S-单位方程中使用我们的证明。

英文摘要:

Let G be a simple finite graph such that each vertex has an integer value and different vertices have different values. Let S be a finite non-empty set of primes. We call G an S-graph if any two vertices are connected by an edge if and only their values differ by a number which is composed of primes from S. We prove e.g. that for every G there exist infinitely many finite sets S such that G is an S-graph. We deal with cycles and complete bipartite graphs G. We consider the triangles in G for a deeper analysis. Finally we prove that G is an S-graph for all S if and only if G is cubical. Besides combinatorial and numbertheoretical arguments some deep Diophantine results concerning S-unit equations are used in our proofs.

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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