Which of the following statements is FALSE?
- `∀ a, b ∈ RR,` `a < b \ => \ a^3 < b^3`
- `∀ a, b ∈ RR,` `a < b \ => e^{-a} > e^{-b}`
- `∀ a, b ∈ (0, + ∞),` `a < b \ => \ text{ln} \ a < text{ln} \ b`
- `∀ a, b ∈ RR, text{with} \ a,b ≠ 0,` `a < b \ => \ 1/a > 1/b`