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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.
The subproof is completed by applying PNoEq_sym_ with
x0
,
λ x3 .
x3
∈
x1
,
λ x3 .
x3
∈
x2
.
■