Let x0 of type ι be given.
Let x1 of type ι → ι be given.
Let x2 of type ι be given.
Apply H0 with
λ x3 . x3 = pack_u_e x0 x1 x2 ⟶ x2 ∈ x0 leaving 2 subgoals.
Let x3 of type ι be given.
Let x4 of type ι → ι be given.
Assume H1: ∀ x5 . x5 ∈ x3 ⟶ x4 x5 ∈ x3.
Let x5 of type ι be given.
Assume H2: x5 ∈ x3.
Apply pack_u_e_inj with
x3,
x0,
x4,
x1,
x5,
x2,
x2 ∈ x0 leaving 2 subgoals.
The subproof is completed by applying H3.
Assume H4:
and (x3 = x0) (∀ x6 . x6 ∈ x3 ⟶ x4 x6 = x1 x6).
Apply H4 with
x5 = x2 ⟶ x2 ∈ x0.
Assume H5: x3 = x0.
Assume H6: ∀ x6 . x6 ∈ x3 ⟶ x4 x6 = x1 x6.
Assume H7: x5 = x2.
Apply H5 with
λ x6 x7 . x2 ∈ x6.
Apply H7 with
λ x6 x7 . x6 ∈ x3.
The subproof is completed by applying H2.
Let x3 of type ι → ι → ο be given.
The subproof is completed by applying H1.