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