### 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)