On local antimagic vertex coloring of corona products related to friendship and fan graph

Let G =( V , E ) be connected graph. A bijection f  :  E  → {1,2,3,..., | E |} is a local antimagic of G if any adjacent vertices u,v  ∈  V  satisfies w ( u )≠  w ( v ), where w ( u )=∑ e∈E(u)  f ( e ), E ( u ) is the set of edges incident to u . When vertex u is assigned the color w ( u ), we called it a local antimagic vertex coloring of G . A local antimagic chromatic number of G , denoted by χ la ( G ), is the minimum number of colors taken over all colorings induced by the local antimagic labeling of G . In this paper, we determine the local antimagic chromatic number of corona product of friendship and fan with null graph on m vertices, namely,  χ la ( F n  ⊙ \overline{K_m}) and  χ la ( f (1,n)  ⊙ \overline{K_m}).