New results on the harmonic index and its generalizations Articles uri icon

publication date

  • May 2017

start page

  • 387

end page

  • 404

issue

  • 2

volume

  • 78

international standard serial number (ISSN)

  • 0340-6253

abstract

  • In this paper we obtain new inequalities involving the harmonic index and the(general) sum-connectivity index, and characterize graphs extremal with respect tothem. In particular, we improve and generalize some known inequalities and werelate this indices to other well-known topological indices.