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Proofgold Proof
pf
Let x0 of type
ο
be given.
Let x1 of type
ο
be given.
Let x2 of type
ο
be given.
Assume H0:
x0
⟶
x2
.
Assume H1:
x1
⟶
x2
.
Assume H2:
or
x0
x1
.
Apply H2 with
x2
leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
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