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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Let x2 of type
ι
→
ο
be given.
Let x3 of type
ι
→
ο
be given.
Assume H0:
PNoLt_
(
binintersect
x0
x1
)
x2
x3
.
Apply or3I1 with
PNoLt_
(
binintersect
x0
x1
)
x2
x3
,
and
(
and
(
x0
∈
x1
)
(
PNoEq_
x0
x2
x3
)
)
(
x3
x0
)
,
and
(
and
(
x1
∈
x0
)
(
PNoEq_
x1
x2
x3
)
)
(
not
(
x2
x1
)
)
.
The subproof is completed by applying H0.
■