Proofgold Proof

pf
Let x0 of type ι be given. Assume H0: ba9d8.. x0. Let x1 of type ι → ο be given. Assume H1: x1 4a7ef... Assume H2: ∀ x2 . x1 x2 ⟶ x1 (4ae4a.. x2). Apply H2 with x0. Apply H0 with x1 leaving 2 subgoals. The subproof is completed by applying H1. The subproof is completed by applying H2. ■