A flow in a residual network provides a roadmap for adding flow to the original flow network.If f is a flow in G and f is a flow in the corresponding residual network Gf,we define f t f',the augmentation of flow f by f',to be a function from Vx V to R,defined by (f↑f,)= fu,)+f'(u,) if(u,v)∈E, 1 otherwise.6 4 5 2 3 1 5 5 4 7 5 6 2 6 4 5 2 3 1 5 5 4 5 3 4 2 6 4 5 2 3 1 5 5 41 2 2