Abstract

For a given graph G, its edge Szeged index is denoted by Sze(G)=∑e=uv∈E(G)mu(e)mv(e), where mu(e) and mv(e) are the number of edges in G with distance to u less than to v and the number of edges in G further (distance) to u than v, respectively. In the paper, the bounds of edge Szeged index on bicyclic graphs are determined. Furthermore, the graphs that achieve the bounds are completely characterized.

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