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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Apply iffEL with
prim1
x1
(
prim3
x0
)
,
∃ x2 .
and
(
prim1
x1
x2
)
(
prim1
x2
x0
)
.
The subproof is completed by applying UnionEq with
x0
,
x1
.
■