Bounds on the first leap Zagreb index of trees.

Autor:	N., Dehgardi, H., Aram
Předmět:	SUM of squares TREES
Zdroj:	Carpathian Mathematical Publications / Karpats'kì Matematičnì Publìkacìï; 2021, Vol. 13 Issue 2, p377-385, 9p
Abstrakt:	The first leap Zagreb index LM1(G) of a graph G is the sum of the squares of its second vertex degrees, that is, LM1(G) = ∑v∈V(G) d2(v/G) ², where d2(v/G) is the number of second neighbors of v in G. In this paper, we obtain bounds for the first leap Zagreb index of trees and determine the extremal trees achieving these bounds [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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