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Proofgold Proof
pf
Let x0 of type
ο
be given.
Assume H0:
x0
.
Apply If_i_1 with
x0
,
1
,
0
,
λ x1 x2 .
0
∈
x2
leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying In_0_1.
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