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Proofgold Proof
pf
Apply functional extensionality with
Inj1
,
setsum
1
.
Let x0 of type
ι
be given.
Let x1 of type
ι
→
ι
→
ο
be given.
The subproof is completed by applying Inj1_setsum_1L with
x0
,
λ x2 x3 .
x1
x3
x2
.
■