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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
(
ι
→
ο
) →
ο
be given.
Let x2 of type
ι
→
ο
be given.
Assume H0:
∀ x3 .
∀ x4 :
(
ι → ο
)
→ ο
.
x2
(
pack_c
x3
x4
)
.
The subproof is completed by applying H0 with
x0
,
x1
.
■