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Proofgold Proof
pf
Let x0 of type
ι
be given.
Assume H0:
x0
∈
u6
.
Let x1 of type
ι
be given.
Assume H1:
x1
∈
u6
.
Apply orIL with
0
∈
u3
,
and
(
0
=
u3
)
(
x0
∈
x1
)
.
The subproof is completed by applying In_0_3.
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