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Theorem ll-trav-nonnull

⊦ cur ≠ null → ( (dll-trav(prv, hd, lst, cur, hd0, lst0, nxt, x) * hP)(h) ↔ (∃ x0, x1, a. x = x0 + (a + x1) ∧ (dlls(hd, lst, prv, cur, x0) * cur => mknode(lst, a, hd0) * dlls(hd0, lst0, cur, nxt, x1) * hP)(h)))