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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ο
be given.
Assume H0:
∀ x2 :
ι → ι
.
bij
x0
x0
x2
⟶
x1
.
Apply H0 with
λ x2 .
x2
.
The subproof is completed by applying bij_id with
x0
.
■