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Proofgold Proof
pf
Let x0 of type
ι
be given.
Apply Empty_eq with
setminus
0
x0
.
Let x1 of type
ι
be given.
Assume H0:
x1
∈
setminus
0
x0
.
Apply EmptyE with
x1
.
Apply setminusE1 with
0
,
x0
,
x1
.
The subproof is completed by applying H0.
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