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On extremal unicyclic molecular graphs with maximal Hosoya index

机译:关于具有最大Hosoya指数的极值单环分子图

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Let G be a unicyclic n-vertex graph and Z(G) be its Hosoya index, let F-n stand for the nth Fibonacci number. It is proved in this paper that Z(G) <= Fn+1 + Fn-1 with the equality holding if and only if G is isomorphic to C-n. the n-vertex cycle, and that if G not equal C-n then Z(G) <= Fn+1 + 2F(n-3) with the equality holding if and only if G = Q(n) or D-n, where graph Q(n) is obtained by pasting one endpoint of a 3-vertex path to a vertex of Cn-2 and D-n is obtained by pasting one endpoint of an (n - 3)-vertex path to a vertex of C-4. (C) 2008 Elsevier B.V. All rights reserved.
机译:令G为单圈n顶点图,Z(G)为Hosoya指数,令F-n代表第n个斐波那契数。本文证明了Z(G)<= Fn + 1 + Fn-1具有相等性,当且仅当G与C-n同构。 n个顶点循环,并且如果G不等于Cn,则Z(G)<= Fn + 1 + 2F(n-3)且等式成立且仅当G = Q(n)或Dn时,其中图Q (n)是通过将3个顶点路径的一个端点粘贴到Cn-2的顶点获得的,而Dn是通过将(n-3)个顶点路径的一个端点粘贴到C-4的顶点获得的。 (C)2008 Elsevier B.V.保留所有权利。

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