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On the extremal Merrifield-Simmons index and Hosoya index of quasi-tree graphs

机译:关于拟树图的极值Merrifield-Simmons指数和Hosoya指数

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It is well known that the two graph invariants, "the Merrifield-Simmons index" and "the Hosoya index" are important in structural chemistry. A graph G is called a quasi-tree graph, if there exists u(0) in V(G) such that G-u(0) is a tree. In this paper, at first we characterize the n-vertex quasi-tree graphs with the largest, the second-largest, the smallest and the second-smallest Merrifield-Simmons indices. Then we characterize the n-vertex quasi-tree graphs with the largest, the second-largest, the smallest and the second-smallest Hosoya indices, as well as those n-vertex quasi-tree graphs with k pendent vertices having the smallest Hosoya index.
机译:众所周知,两个图不变式,“ Merrifield-Simmons指数”和“ Hosoya指数”在结构化学中很重要。如果在V(G)中存在u(0)使得G-u(0)是树,则图G称为准树图。在本文中,首先我们用最大,第二大,最小和第二小Me​​rrifield-Simmons指数来表征n顶点准树图。然后,我们描述具有最大,第二大,最小和第二小的Hosoya索引的n顶点准树图,以及具有k个下垂顶点且具有最小Hosoya索引的n顶点准树图。 。

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