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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Assume H0:
x0
=
x1
⟶
∀ x2 : ο .
x2
.
Assume H1:
x1
=
x0
.
Apply H0.
Let x2 of type
ι
→
ι
→
ο
be given.
The subproof is completed by applying H1 with
λ x3 x4 .
x2
x4
x3
.
■