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Proofgold Proof
pf
Let x0 of type
ι
be given.
Apply Inj1_eq with
x0
,
λ x1 x2 .
0
∈
x2
.
Apply binunionI1 with
Sing
0
,
{
Inj1
x1
|x1 ∈
x0
}
,
0
.
The subproof is completed by applying SingI with
0
.
■