• MULTIPLICATIVE HYPER-ZAGREB INDICES AND COINDICES OF GRAPHS: COMPUTING THESE INDICES OF SOME NANOSTRUCTURES

V. R. KULLI*

Abstract


In this paper, we introduce the first and second multiplicative hyper-Zagreb indices of a graph. The first multiplicative hyper-Zagreb index is defined as the product of squares of the sum of the degrees of pairs of adjacent vertices. The second multiplicative hyper- Zagreb index is defined as the product of squares of the product of the degrees of pairs of adjacent vertices. Also we introduce the first and second multiplicative hyper-Zagreb coindices of a graph. In this paper, the first and second multiplicative hyper-Zagreb indices of cycles, complete graphs, complete bipartite graphs and r-regular graphs are determined. Also we compute exact formulas of the multiplicative hyper-Zagreb indices for    G = TUSC4C8(S) nanotubes, G1 = VPHX [m, n] nanotues and G2 = VPHY [m, n] nanotorus.


Keywords


Molecular graph, multiplicative hyper-Zagreb index, multiplicative hyper-Zagreb coindex, nanotubes, nanotorus.

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