Abstract
Let G be a simple graph with vertex set {v1,v2,...,vn} .T he common neighborhood graph (congraph) of G, denoted by con(G), is the graph with vertex set {v1,v2,...,vn}, in which two vertices are adjacent if and only they have at least one common neighbor in the graph G.T he basic properties of con(G) and of its energy are established.
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More From: Iranian Journal of Mathematical Sciences and Informatics
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