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Proofgold Proof

pf
Let x0 of type ι be given.
Let x1 of type ιι be given.
Let x2 of type ι be given.
Assume H0: prim1 x2 (a842e.. x0 (λ x3 . x1 x3)).
Let x3 of type ο be given.
Assume H1: ∀ x4 . prim1 x4 x0prim1 x2 (x1 x4)x3.
Apply unknownprop_6e713ef2b1c9d2089dead8e3d98fed6bda91ffc6b807ed8732c89724a15f5c2c with x0, x1, x2, x3 leaving 2 subgoals.
The subproof is completed by applying H0.
Let x4 of type ι be given.
Assume H2: (λ x5 . and (prim1 x5 x0) (prim1 x2 (x1 x5))) x4.
Apply H2 with x3.
The subproof is completed by applying H1 with x4.