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Proofgold Proof
pf
Apply not_def with
λ x0 x1 :
ο → ο
.
∀ x2 : ο .
not
x2
⟶
x0
x2
.
Let x0 of type
ο
be given.
Assume H0:
not
x0
.
The subproof is completed by applying H0.
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