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Proofgold Proof
pf
Assume H0:
2
∈
1
.
Apply ordsuccE with
0
,
2
,
False
leaving 3 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying EmptyE with
2
.
The subproof is completed by applying neq_2_0.
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