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Proofgold Proof
pf
Let x0 of type
ο
be given.
Apply andI with
x0
⟶
x0
,
x0
⟶
x0
leaving 2 subgoals.
Assume H0:
x0
.
The subproof is completed by applying H0.
Assume H0:
x0
.
The subproof is completed by applying H0.
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