Investigates extremal properties of contraharmonic index in unicyclic graphs, indicating potential bounds for other graph types.
Let G be a graph with edge set E ( G ). The degree of a vertex w in G is denoted by d w . The contraharmonic index of G is defined as . In this paper, we investigate several properties of the contraharmonic index, including extremal results for unicyclic graphs of a given order, as well as bounds and the effects of an edge removal in graphs.
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Alotaibi et al. (2026) studied this question.
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