Terminology

Subgraph G´ of graph G ifG = (V,A), G´ = (V´, A´) and V´? V and A´={x?y | x?y ? A and x,y ? V´}

Subgraph G´ of graph G if G = (V,A), G´ = (V´, A´) and V´? V and A´={x?y | x?y ? A and x,y ? V´}