3. (5+5 points) (a) Let ICS(P), 41,...,4., 6 e S(P). Show that if 1+ 41,5 42, ..., 1 Yn and 41, ..., Pn+ , then I F 8. Apply this to show that if 1,70 and 14, then . (b) Prove the formal theorem (VI) = 4. 3. (5+5 points) (a) Let ICS(P), 41,...,4., 6 e S(P). Show that if 1+ 41,5 42, ..., 1 Yn and 41, ..., Pn+ , then I F 8. Apply this to show that if 1,70 and 14, then . (b) Prove the formal theorem (VI) = 4