Restrained differential of a graph
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vS N (v) \ S, while the restrained external neighbourhood of S is defined as S r = {v S e : N (v) S e = }. The restrained differential of a graph G is defined as r (G) = max{|S r | -|S| : S V (G)}. In this paper, we introduce the study of the restrained differential of a graph. We show that this novel parameter 2 A. Cabrera-Martnez, M