Proofgold Proof

pf
Let x0 of type ο be given. Let x1 of type ο be given. Let x2 of type ο be given. Assume H0: x0 ⟶ x1 ⟶ x2. Assume H1: and x0 x1. Apply andE with x0, x1, x2 leaving 2 subgoals. The subproof is completed by applying H1. The subproof is completed by applying H0. ■