ON DISTANCE-BASED TOPOLOGICAL INDICES OF HC5C7[4p,8] NANOTUBES
نویسندگان
چکیده
Let G be a connected graph, nu(e) is the number of vertices of G lying closer to u and nv(e) is the number of vertices of G lying closer to v. Then the Szeged index of G is defined as the sum of nu(e)nv(e), over edges of G.. The PI index of G is a Szeged-like topological index defined as the sum of [mu(e)+ mv(e)], where mu(e) is the number of edges of G lying closer to u than to v, mv(e) is the number of edges of G lying closer to v than to u and summation goes over all edges of G. In this paper, the PI and Szeged indices of a HC5C7[4p,8] nanotube are computed for the first time.
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