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Proof step 7 from proof ll-trav2-end (previous step)

⊦ r1 ≠ null → (((ll-trav(r0, r1, r2, x) * P))(H) ↔ (∃ x0, x1, a. x = x0 + (a + x1) ∧ ((lls(r0, r1, x0) * r1 => a × r2 * lls(r2, null, x1) * P))(H)))

Lemma ll-trav2-nonnull-def