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Proof step 1 from proof ls-unfold1 (conclusion)

r ≠ null ⊦ H[r] = ce → (((ls(r, x) * P))(H) ↔ (∃ a, y, r0. ((r => a × r0 * ls(r0, y) * P))(H) ∧ x = a ' + y))

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information