Proofgold Proof

pf
Let x0 of type ι be given. Let x1 of type ι be given. Let x2 of type ι be given. Assume H0: ∀ x3 . prim1 x3 x0 ⟶ iff (prim1 x3 x1) (prim1 x3 x2). The subproof is completed by applying H0. ■