The Radio Dd-Distance in Harmonic Mean Number of Some New Graphs

**MLA Style: ** K John Bosco, B S Vishnupriya. "The Radio Dd-Distance in Harmonic Mean Number of Some New Graphs" International Journal of Mathematics Trends and Technology 67.2 (2021):121-123. **APA Style: **K John Bosco, B S Vishnupriya(2021). The Radio Dd-Distance in Harmonic Mean Number of Some New Graphs. International Journal of Mathematics Trends and Technology, 121-123.

**Abstract**

A radio Dd-distance in harmonic mean labelling of a connected graph G is an injective map f from the vertex set V(G) to the N such that for two distinct vertices u and v of G, DDd(u,v)+[2f(u)f(v)/f(u)+f(v)]≥diam^{Dd}(G)+1. where D^{Dd}(u,v) denote Dd-distance between u and v diam^{Dd}(G) denotes the diameter of G. The radio Dd-distance in harmonic mean number of f, rh^{Dd}n(f) is the maximum label assigned to any vertex of G. The radio Dd-distance in harmonic mean number of G, rh^{Dd}n(G) is the minimum value of G. In the paper we find the radio Dd-distance in harmonic mean number of some standard graphs.

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**Keywords : **Dd-distance, Radio harmonic mean number, Radio Dd-distance in harmonic mean number.