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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
be given.
The subproof is completed by applying lam_eta with
3
,
λ x3 .
If_i
(
x3
=
0
)
x0
(
If_i
(
x3
=
1
)
x1
x2
)
.
■