V(G) 1 2 14. For G E FBRT, let P(G) be the number of edges with positive slope. Prove that P(G) = by structural induction (recall that v(G) is the number of vertices). You may assume P(G1 *G2) = P(G1) + P(G2) + 1 and v(G1 *G2) = v(G1) +v(G2) +1 without proof. V(G) 1 2 14. For G E FBRT, let P(G) be the number of edges with positive slope. Prove that P(G) = by structural induction (recall that v(G) is the number of vertices). You may assume P(G1 *G2) = P(G1) + P(G2) + 1 and v(G1 *G2) = v(G1) +v(G2) +1 without proof