On Harary index of graphs

The Harary index is defined as the sum of reciprocals of distances between all pairs of vertices of a connected graph. For a connected graph G=(V,E) and two nonadjacent vertices v sub(i and v) sub(j) in V(G) of G, recall that G+v sub(iv) sub(j) is the supergraph formed from G by adding an edge betwe...

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