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Vulnerability Measures and Zagreb Indices of Graphs

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arxiv 2505.24707 v1 pith:HAA2XVRN submitted 2025-05-30 math.CO

Vulnerability Measures and Zagreb Indices of Graphs

classification math.CO
keywords graphsclosenessboundsindiceszagrebgeneralizeddiameterformulas
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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This paper establishes sharp bounds for the vulnerability measures of closeness and generalized closeness in graphs and identifies graphs that attain these bounds. It further develops bounds incorporating Zagreb indices for triangle- and quadrangle-free graphs, yielding formulas for closeness and generalized closeness in such graphs with diameter at most 3. Moreover, using Zagreb indices, we derive bounds for trees and connected graphs with girth at least 7, which are attained by graphs with diameter at most 4. Finally, formulas for closeness and generalized closeness in specific trees are established using Zagreb indices.

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