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Proof step 4 from proof lls-unfold-head-simp (
previous step
)
x ≠ [] ⊦ ((lls(r0, r2, x) * P))(H) ↔ (∃ a, y, r1. ((r0 => a × r1 * lls(r1, r2, y) * P))(H) ∧ x = a ' + y)
Lemma
lls-unfold-head