IRREGULARITY AND TOTAL IRREGULARITY OF NEIGHBOURHOOD CORONA OF TWO GRAPHS

Two of the irregularity measures of a graph G are irregularity, irr(G) = ΣuveE(G) |dG(u) – dG(v)|, and total irregularity, irr+(G) = ½ Σu,vev (G) |dG (u) – dG(v), where dG(u) denotes the degree of a vertex u. In this paper, we study the irregularity and the total irregularity of neighbourhood corona of two graphs.

کلیدواژه ها:

irregularity ، total irregularity ، neighbourhood corona