Let x0 of type ι be given.

Let x1 of type ι be given.

Assume H0: prim1 x1 x0.

Let x2 of type ι be given.

Assume H1: prim1 x2 x0.

Let x3 of type ι → ο be given.

Assume H2: ∀ x4 x5 . prim1 x5 x4 ⟶ ∀ x6 . prim1 x6 x4 ⟶ x3 (59c41.. x4 x5 x6).

Apply H2 with x0, x1, x2 leaving 2 subgoals.

The subproof is completed by applying H0.

The subproof is completed by applying H1.

■

Proofgold Proof