Connected (n,m)-graphs with minimum and maximum zeroth-order general Randić index

  • Authors:
  • Yumei Hu;Xueliang Li;Yongtang Shi;Tianyi Xu

  • Affiliations:
  • Center for Combinatorics and LPMC, Nankai University, Tianjin 300071, PR China and Department of Mathematics, Tianjin University, Tianjin 300072, PR China;Center for Combinatorics and LPMC, Nankai University, Tianjin 300071, PR China;Center for Combinatorics and LPMC, Nankai University, Tianjin 300071, PR China;Center for Combinatorics and LPMC, Nankai University, Tianjin 300071, PR China

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2007

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Abstract

Let G be a graph and d(v) denote the degree of a vertex v in G. Then the zeroth-order general Randic index R@a0(G) of the graph G is defined as @?"v"@?"V"("G")d(v)^@a, where @a is a pertinently chosen real number. We characterize, for any @a, the connected (n,m)-graphs with minimum and maximum R@a0.