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Free will, n., the doctrine that human beings (and possibly other beings, such angels or higher animals) are able to choose their actions without being caused to do so by external forces.
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Determinism, n., the doctrine that all actions are determined by the current state and immutable laws of the universe, with no possibility of choice.
Newtonian physics indicates that "once the initial conditions of the universe have been established the rest of the history of the universe follows inevitably. And if someone knew the precise location and momentum of every atom in the universe then he could use Newton's laws to reveal the entire course of cosmic events, past and future." (This someone is called 'Laplace's demon.') Therefore human beings' actions are limited and free will does not exist.
However, Newtonian physics is considered a 'simplified' and 'statistical' form of quantum mechanics, rather convenient than accurate. Quantum mechanics itself has a probabilistic nature, for example the uncertainty principle or electron cloud model. Thus it has been said "quantum mechanics provides probabilistic results because the physical universe is itself probabilistic rather than deterministic," (which results in Einstein's famous quote, "God does not play dice.")
And what is you view of free will? Is it real or illusory?
P.S. In my case, I'm a determinist.