n mean natural numbers without zero: 1, 2, 3, ... lim_{n → ∞} n = ∞; n: 1, 2, 3, 4, 5, 6, ... → ∞; n: 1, 2, 3, 4, 5, 6, ... → ∞; lim_{n → ∞} (-n) = -∞; n: 1, 2, 3, 4, 5, 6, ... → ∞; n: -1, -2, -3, -4, -5, -6, ... → -∞; lim_{n → ∞} 1/n = 0; n: 1, 2, 3, 4, 5, 6, ... → ∞; n: 1, 1/2, 1/3, 1/4, 1/5, 1/6, ... → 0; lim_{n → ∞} (n+1)/(n+2) = 1; n: 1, 2, 3, 4, 5, 6, ... → ∞; n: 2/3, 3/4, 4/5, 5/6, 6/7, 7/8... → 0.