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Another look at the degree-Kirchhoff index
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 $$R' (G) \ge 2\vert E\vert \left( {N - 2 + {1 \over {D + 1}}} \right).$$ We also show that the minimum of R′(G) over all N‐vertex graphs is...
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Published in: | International journal of quantum chemistry 2011-11, Vol.111 (14), p.3453-3455 |
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container_end_page | 3455 |
container_issue | 14 |
container_start_page | 3453 |
container_title | International journal of quantum chemistry |
container_volume | 111 |
creator | Palacios, José Luis Renom, José Miguel |
description | 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
$$R' (G) \ge 2\vert E\vert \left( {N - 2 + {1 \over {D + 1}}} \right).$$
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 |
doi_str_mv | 10.1002/qua.22725 |
format | article |
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$$R' (G) \ge 2\vert E\vert \left( {N - 2 + {1 \over {D + 1}}} \right).$$
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$$R' (G) \ge 2\vert E\vert \left( {N - 2 + {1 \over {D + 1}}} \right).$$
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$$R' (G) \ge 2\vert E\vert \left( {N - 2 + {1 \over {D + 1}}} \right).$$
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subjects | Kirchhoff index star graph |
title | Another look at the degree-Kirchhoff index |
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