ABSTRACT
An oblong sum labeling of a graph G = (V,E) with p vertices and q edges is a one to one function f:V(G) β {0,2,4,6,…} that induces a bijection f* : E(G) β {π1,π2,π3,…, ππ} of the edges of G defined by f*(uv) = f(u) + f(v) for all e = uv β E(G). The graph that admits oblong sum labeling is called oblong sum graph. In this article, the oblong sum labeling of union of some graphs are studied.
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