Let x0 of type ο be given.
Let x1 of type ο be given.
Assume H0:
not (x0 ⟶ x1).
Apply notE with
x0 ⟶ x1 leaving 2 subgoals.
The subproof is completed by applying H0.
Assume H2: x0.
Apply unknownprop_b777a79c17f16cd28153af063df26a4626b11c1f1d4394d7f537c11837ab0962 with
x1.
Apply H1 leaving 2 subgoals.
The subproof is completed by applying H2.
The subproof is completed by applying H3.