arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1801.02532math.CO
收藏

关于两个Zagreb指数的差异性

On the Discrepancy Between Two Zagreb Indices

Ashwin Sah, Mehtaab Sawhney

摘要:

我们研究的数量\[S(G) = \sum_{uv\in E(G)} \min(\text{deg } u, \text{deg } v)\]在一个固定的边数的图集。主要结果表明,$S(G)$的最大可能值是通过三种不同的结构,取决于边的数量和最近的三角形数之间的距离。此外,我们确定的最大可能的值时,一组图被限制为二分,森林或平面给予足够多的边缘。量$S(G)$对应于两个充分研究的指数之间的差,图的不规则性和图中度的平方和。这些被称为数学化学领域的第一和第三萨格勒布指数。

英文摘要:

We examine the quantity \[S(G) = \sum_{uv\in E(G)} \min(\text{deg } u, \text{deg } v)\] over sets of graphs with a fixed number of edges. The main result shows the maximum possible value of $S(G)$ is achieved by three different classes of constructions, depending on the distance between the number of edges and the nearest triangular number. Furthermore we determine the maximum possible value when the set of graphs is restricted to be bipartite, a forest or to be planar given sufficiently many edges. The quantity $S(G)$ corresponds to the difference between two well studied indices, the irregularity of a graph and the sum of the squares of the degrees in a graph. These are known as the first and third Zagreb indices in the area of mathematical chemistry.

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。

↑