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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
→
ο
be given.
Let x2 of type
ι
be given.
Let x3 of type
ι
→
ο
be given.
Assume H0:
PNoCutR
x0
x1
x2
x3
.
Apply H0 with
x2
∈
x0
.
Assume H1:
x2
∈
x0
.
Assume H2:
PNoLt
x0
x1
x2
x3
.
The subproof is completed by applying H1.
■