On the bounds of the first reformulated Zagreb index.

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Abstract

The edge version of traditional first Zagreb index is known as first reformulated Zagreb index. In this paper, we analyze and compare various lower and upper bounds for the first reformulated Zagreb index and we propose new lower and upper bounds which are stronger than the existing and recent results [Appl. Math. Comp. 273 (2016) 1620]. In addition, we prove that our bounds are superior in comparison with the other existing bounds.