The aim of this paper is to obtain new sharp inequalities for a large family of topological indices, including the second variable Zagreb index , and to characterize the set of extremal graphs with respect to them. Our main results provide lower bounds on this family of topological indices involving just the minimum and the maximum degree of the graph. These inequalities are new even for the RandiAc, the second Zagreb and the modified Zagreb indices.
机构:
Department of Mathematics, School of Science, University of Management and Technology, Lahore,54770, PakistanDepartment of Mathematics, School of Science, University of Management and Technology, Lahore,54770, Pakistan
Ibraheem, Muhammad
Ahmad, Uzma
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Department of Mathematics, University of the Punjab, Lahore, PakistanDepartment of Mathematics, School of Science, University of Management and Technology, Lahore,54770, Pakistan
Ahmad, Uzma
Zhu, Q.
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School of Mathematics and Statistics, Hunan Normal University, Hunan, Changsha,4100081, China
Department of Mathematics, School of Information Science and Engineering, Chengdu University, Chengdu,610106, ChinaDepartment of Mathematics, School of Science, University of Management and Technology, Lahore,54770, Pakistan
机构:
Univ Castilla La Mancha, Fac Ciencias Sociales, Avda Real Fabrica de Seda S-N, Toledo 45600, SpainUniv Castilla La Mancha, Fac Ciencias Sociales, Avda Real Fabrica de Seda S-N, Toledo 45600, Spain
Martinez-Perez, Alvaro
Rodriguez, Jose M.
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Univ Carlos III Madrid, Dept Matemat, Ave Univ 30, Madrid 28911, SpainUniv Castilla La Mancha, Fac Ciencias Sociales, Avda Real Fabrica de Seda S-N, Toledo 45600, Spain
机构:
Imam Khomeini Int Univ, Fac Sci, Dept Math, POB 3-4148-96818, Qazvin, IranImam Khomeini Int Univ, Fac Sci, Dept Math, POB 3-4148-96818, Qazvin, Iran