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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ι be given.
Assume H0: setsum (ap x0 0) (ap x0 1) = x0.
Assume H1: x0x1.
Apply apI with x1, ap x0 0, ap x0 1.
Apply H0 with λ x2 x3 . x3x1.
The subproof is completed by applying H1.