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Proofgold Proof
pf
Let x0 of type
ι
be given.
Assume H0:
x0
∈
0
.
Apply EmptyAx.
Let x1 of type
ο
be given.
Assume H1:
∀ x2 .
x2
∈
0
⟶
x1
.
Apply H1 with
x0
.
The subproof is completed by applying H0.
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