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Proofgold Proof
pf
Let x0 of type
ι
→
ι
→
ο
be given.
Apply unknownprop_35d7272c7b1090adf039ff70dc114e19a71ebd839991971d40fc5bc1bb7e485c with
λ x1 x2 :
(
ι →
ι → ο
)
→ ο
.
(
∀ x3 .
x0
x3
x3
)
⟶
x2
x0
.
Assume H0:
∀ x1 .
x0
x1
x1
.
The subproof is completed by applying H0.
■