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The concepts of geometric-arithmetic and harmonic indices were introduced in the area of chemical graph theory recently. They have proven to correlate well with physical and chemical properties of some molecules. The aim of this paper is to obtain new inequalities involving the first Zagreb, the harmonic, and the geometric-arithmetic GA1 indices. Furthermore, inequalities relating these indices and line graphs are proven.
first zagreb index; geometric-arithmetic index; harmonic index; line graph; vertex¿egree-based topological index