What happens to the difference veon each step of the pruning

What happens to the difference v-eon each step of the pruning process?

Solution

Prunning Process is defined as the method that reduced the number of nodes in a graph that can be evaluated by using the min-max algorith from search trees

In every step, the node that contains the vertices that contains the highest value has been removed from the graph network, since it can provide the most optimal solution

The difference of (v-e) will become more and more negative