Proofgold Proof

pf
Let x0 of type ι be given. Let x1 of type ι → ο be given. Let x2 of type ι → ο be given. Let x3 of type ι → ο be given. Assume H0: ∀ x4 . ∀ x5 x6 : ι → ο . x3 (pack_p_p x4 x5 x6). The subproof is completed by applying H0 with x0, x1, x2. ■