### Abstract

The Padmakar-Ivan (PI) index of a graph G is defined as PI(G) = ∑[n_{eu}(e|G) + n_{ev}(e|G)], where n_{eu}(e|G) is the number of edges of G lying closer to u than to v, n_{ev}(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 language | English |
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Pages (from-to) | 181-184 |

Number of pages | 4 |

Journal | Journal of Physics: Conference Series |

Volume | 29 |

Issue number | 1 |

DOIs | |

Publication status | Published - Jan 1 2006 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

**Computing the PI index of some chemical graphs related to nanostructures.** / Ashrafi, A. R.; Vakili-Nezhaad, G. R.

Research output: Contribution to journal › Article

*Journal of Physics: Conference Series*, vol. 29, no. 1, pp. 181-184. https://doi.org/10.1088/1742-6596/29/1/035

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TY - JOUR

T1 - Computing the PI index of some chemical graphs related to nanostructures

AU - Ashrafi, A. R.

AU - Vakili-Nezhaad, G. R.

PY - 2006/1/1

Y1 - 2006/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=32144448720&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=32144448720&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/29/1/035

DO - 10.1088/1742-6596/29/1/035

M3 - Article

VL - 29

SP - 181

EP - 184

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

ER -