Abstract
Let G be an arbitrary graph with vertex set 1,2, …,N and degrees di ≤ D, for fixed D and all i, then for the index R′(G) = ∑i < jdidjRij we show that
$$R' (G) 2Ełeft( N - 2 + 1 D + 1 \right).$$
We also show that the minimum of R′(G) over all N-vertex graphs is attained for the star graph and its value is 2N2 − 5N + 3. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011
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