Let x0 of type ι be given.
Let x1 of type ι be given.
Assume H0:
not (x0 = x1).
Apply unknownprop_e284d5f5a7c3a1c03631041619c4ddee06de72330506f5f6d9d6b18df929e48c with
x1 = x0.
Assume H1: x1 = x0.
Apply notE with
x0 = x1 leaving 2 subgoals.
The subproof is completed by applying H0.
Let x2 of type ι → ι → ο be given.
The subproof is completed by applying H1 with λ x3 x4 . x2 x4 x3.