Let x0 of type ι be given.
Let x1 of type ι → ι → ι be given.
Let x2 of type ι → ι → ι be given.
Let x3 of type ι → ο be given.
Let x4 of type ι → ο be given.
Let x5 of type ι be given.
Let x6 of type ι be given.
Assume H0:
∀ x7 . prim1 x7 x0 ⟶ ∀ x8 . prim1 x8 x0 ⟶ x1 x7 x8 = x2 x7 x8.
Assume H1:
∀ x7 . prim1 x7 x0 ⟶ iff (x3 x7) (x4 x7).