PI indices of tori Tp,q[C4, C8] covered by C4 and C8

被引：0
|
作者：
Xu, Lixin
Deng, Hanyuan [1 ]
机构：
[1] Hunan Normal Univ, Coll Math & Comp Sci, Changsha 410081, Hunan, Peoples R China
[2] Shaoyang Coll, Dept Math, Shaoyang 422004, Hunan, Peoples R China
来源：
MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY | 2007年 / 57卷 / 02期
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D O I：
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中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The Padmakar-Ivan (PI) index of a graph G = (VE) is defined as PI(G) = Sigma(e is an element of E)(n(u)(e)+ n(v)(e)), where e = uv, n(u)(e) is the number of edges of G lying closer to u than to v and n(v)(e) is the number of edges of G lying closer to v than to u. In this paper, a formula for calculating the PI index of a torus T-p,T-q[C-4, C-8] is given.
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页码：485 / 502
页数：18
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