Let x0 of type ι → ο be given.
Let x1 of type ι be given.
Assume H0:
not (∃ x2 . x0 x2).
Apply notE with
∃ x2 . x0 x2 leaving 2 subgoals.
The subproof is completed by applying H0.
Let x2 of type ο be given.
Assume H2: ∀ x3 . x0 x3 ⟶ x2.
Apply H2 with
x1.
Apply unknownprop_b777a79c17f16cd28153af063df26a4626b11c1f1d4394d7f537c11837ab0962 with
x0 x1.
The subproof is completed by applying H1.