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Proofgold Proof
pf
Let x0 of type
ι
→
ο
be given.
Assume H0:
∃ x1 .
x0
x1
.
Apply H0 with
x0
(
prim0
x0
)
.
Let x1 of type
ι
be given.
Assume H1:
(
λ x2 .
x0
x2
)
x1
.
Apply Eps_i_ax with
x0
,
x1
.
The subproof is completed by applying H1.
■