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Proofgold Proof
pf
Let x0 of type
ι
be given.
Assume H0:
0
=
Sing
x0
.
Apply EmptyE with
x0
.
Apply H0 with
λ x1 x2 .
x0
∈
x2
.
The subproof is completed by applying SingI with
x0
.
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