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Proofgold Proof
pf
Assume H0:
TransSet
(
Sing
2
)
.
Claim L1:
0
∈
Sing
2
Apply H0 with
2
,
0
leaving 2 subgoals.
The subproof is completed by applying SingI with
2
.
The subproof is completed by applying In_0_2.
Apply neq_0_2.
Apply SingE with
2
,
0
.
The subproof is completed by applying L1.
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