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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Assume H0:
not
(
Subq
x0
x1
)
.
Assume H1:
not
(
∀ x2 .
In
x2
x0
⟶
In
x2
x1
)
⟶
False
.
Apply H1.
Apply unknownprop_5d43e074a46031aba9b972e1346a32eab5bc6d7f8cd872222d3a15fe3889dd90 with
λ x2 x3 :
ι →
ι → ο
.
not
(
x2
x0
x1
)
.
The subproof is completed by applying H0.
■