Let x0 of type ι → ι be given.
Let x1 of type ι → ο be given.
Assume H0: ∀ x2 . x1 x2 ⟶ x1 (x0 x2).
Let x2 of type ι be given.
Assume H1: x1 x2.
Apply unknownprop_15156acfaef83289041d2fede437e15a29e8b8de66c5ea43e1171f433b1a0acd with
x0,
x1,
ChurchNum_ii_6 ChurchNum2 x0 x2 leaving 2 subgoals.
The subproof is completed by applying H0.
Apply unknownprop_15156acfaef83289041d2fede437e15a29e8b8de66c5ea43e1171f433b1a0acd with
x0,
x1,
x2 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.