| ∃ lf. lf(0) = nextl(0, a) ∧ (∀ m. m < n0 → lf(m + 1) = nextl(m + 1, lf(m).last)) ⊦ ∃ lf. lf(0) = nextl(0, a) ∧ (∀ m. ¬ n0 < m → lf(m + 1) = nextl(m + 1, lf(m).last)) |
lf(0) = nextl(0, a), ∀ m. m < n0 → lf(m + 1) = nextl(m + 1, lf(m).last) ⊦ ∃ lf. lf(0) = nextl(0, a) ∧ (∀ m. ¬ n0 < m → lf(m + 1) = nextl(m + 1, lf(m).last))