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Proofgold Proof
pf
Let x0 of type
ο
be given.
Assume H0:
not
x0
.
Assume H1:
x0
.
Apply FalseE.
Apply notE with
x0
leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
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