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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.
Let x3 of type
ι
be given.
The subproof is completed by applying lam_eta with
4
,
λ x4 .
If_i
(
x4
=
0
)
x0
(
If_i
(
x4
=
1
)
x1
(
If_i
(
x4
=
2
)
x2
x3
)
)
.
■