Let x0 of type ι be given.
Let x1 of type (ι → ο) → ο be given.
Let x2 of type (ι → ο) → ο be given.
Let x3 of type ι → ι be given.
Let x4 of type ι → ι be given.
Let x5 of type ι → ο be given.
Let x6 of type ι → ο be given.
Assume H0:
∀ x7 : ι → ο . (∀ x8 . x7 x8 ⟶ prim1 x8 x0) ⟶ iff (x1 x7) (x2 x7).
Assume H1:
∀ x7 . prim1 x7 x0 ⟶ x3 x7 = x4 x7.
Assume H2:
∀ x7 . prim1 x7 x0 ⟶ iff (x5 x7) (x6 x7).