Let x0 of type ι be given.
Let x1 of type ι be given.
Let x2 of type ι → ο be given.
Assume H3:
∀ x3 x4 . x2 x3 ⟶ x2 x4 ⟶ x2 (a3eb9.. x3 x4).
Assume H4:
∀ x3 x4 . x2 x3 ⟶ x2 x4 ⟶ x2 (bf68c.. x3 x4).
Apply H4 with
x0,
x1 leaving 2 subgoals.
Apply H0 with
x2 leaving 3 subgoals.
The subproof is completed by applying H2.
The subproof is completed by applying H3.
The subproof is completed by applying H4.
Apply H1 with
x2 leaving 3 subgoals.
The subproof is completed by applying H2.
The subproof is completed by applying H3.
The subproof is completed by applying H4.