Computing the PI index of some chemical graphs related to nanostructures

A. R. Ashrafi*, G. R. Vakili-Nezhaad

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The Padmakar-Ivan (PI) index of a graph G is defined as PI(G) = ∑[neu(e|G) + nev(e|G)], where neu(e|G) is the number of edges of G lying closer to u than to v, nev(e|G) is the number of edges of G lying closer to v than to u and summation goes over all edges of G. The PI Index is a Szeged-like topological index developed very recently. In this paper we report on new results about computing PI index of nanotubes.

Original languageEnglish
Pages (from-to)181-184
Number of pages4
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - Jan 1 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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