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arXiv 2311.17751math.CO
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关于某些原群上的和图

On Sum Graphs over Some Magmas

António Machiavelo, Rogério Reis

AI总结:

本文研究原群上的和图与松弛和图,分类了并集原群下的圈和图,确定了 C4 的阿贝尔群标号及 C4ℓ 的斐波那契相关标号,改进了匹配图半径上界,并证明 4 维立方体有无穷多个本原整数标号。

摘要:

我们考虑原群上的和图与松弛和图的概念,并给出这些图族在若干自然原群上的例子和结果。我们对以集合并运算为原群运算的子集原群,分类了哪些圈是和图;确定了能够为 $C_4$ 提供和标号的阿贝尔群;并证明 $C_{4\ell}$ 是阿贝尔群 $\mathbb{Z}_f\times\mathbb{Z}_f$ 上的和图,其中 $f=f_{2\ell}$ 是对应的斐波那契数。对于整数和图,我们给出了匹配图半径的线性上界,改进了 Harary 对该图族的标号,并给出了完全不连通图族的精确半径。我们找到了 4 维立方体的整数标号,对 Melnikov 和 Pyatikin 的一个问题给出了否定回答,实际上表明 4 维立方体具有无穷多个本原标号。我们还得到了关于模和图与松弛和图的一些新结果。最后,我们证明直积运算对强整数和图族封闭。

英文摘要:

We consider the notions of sum graph and of relaxed sum graph over a magma, give several examples and results of these families of graphs over some natural magmas. We classify the cycles that are sum graphs for the magma of the subsets of a set with the operation of union, determine the abelian groups that provide a sum labelling of $C_4$, and show that $C_{4\ell}$ is a sum graph over the abelian group $\mathbb{Z}_f\times\mathbb{Z}_f$, where $f=f_{2\ell}$ is the corresponding Fibonacci number. For integral sum graphs, we give a linear upper bound for the radius of matchings, improving Harary's labelling for this family of graphs, and give the exact radius for the family of totally disconnected graphs. We found integer labellings for the 4D-cube, giving a negative answer to a question of Melnikov and Pyatikin, actually showing that the 4D-cube has infinitely many primitive labellings. We have also obtained some new results on mod sum graphs and relaxed sum graphs. Finally, we show that the direct product operation is closed for strong integral sum graphs.

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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