I. Natural Sciences
In the natural sciences, necessity usually appears as an implication of causal natural laws (Natural law/Law of nature), according to which by necessity an event A as a cause must be followed by an event B as its consequence. This necessity implied by laws of nature is not undisputed. Empiricism, which goes back to D. Hume, rejects the possibility of human insight into necessary causal connections, preferring to replace the concept of causal necessity with th…