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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
→
ι
be given.
Let x2 of type
ι
be given.
Assume H0:
In
x2
(
famunion
x0
(
λ x3 .
x1
x3
)
)
.
Apply unknownprop_a7f2dda18b84bce65b5de34328a937fef2c23812675d88bde1e7e2463ed59bbe with
x0
,
x1
,
x2
,
False
.
The subproof is completed by applying H0.
■