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Determinism suggests that only one course of events is possible, which is inconsistent with the existence of free will thus conceived. As far as we know, this problem was first suggested by Aristotle in the fourth century B.C.E., but it is still a major focus of philosophical debate.
This view that conceives free will to be incompatible with determinism is called incompatibilism, and encompasses both metaphysical libertarianism, the claim that determinism is false and thus free will is at least possible, and hard determinism, the claim that determinism is true and thus free will is not possible.