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Proofgold Proof
pf
Let x0 of type
ι
→
ο
be given.
Let x1 of type
ι
be given.
Let x2 of type
ι
be given.
Assume H0:
x0
x2
.
Apply orIL with
x0
x2
,
x2
=
x1
.
The subproof is completed by applying H0.
■