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Proofgold Proof
pf
Let x0 of type
ι
be given.
Assume H0:
∀ x1 .
nIn
x1
x0
.
Apply Empty_Subq_eq with
x0
.
Let x1 of type
ι
be given.
Assume H1:
x1
∈
x0
.
Apply FalseE with
x1
∈
0
.
Apply H0 with
x1
.
The subproof is completed by applying H1.
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