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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Let x2 of type
ι
be given.
Let x3 of type
ι
be given.
Apply binunionI2 with
SetAdjoin
(
UPair
x0
x1
)
x2
,
Sing
x3
,
x3
.
The subproof is completed by applying SingI with
x3
.
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