>>11360196You have neglected to take the Heisenberg uncertainty principle into account.
It is true that if we knew the position and momentum of every particle in the universe we could predict the future, but it is physically impossible to know both a particles exact position AND it's momentum at the same time, thus it is physically impossible to predict the future in this fashion.
Building on this inherent uncertainty, we know that until it is observed a given particle (or wave, as it could be either or both in this state) exists in a state of quantum superposition, that is to say it occupies all possible postions/momentum within a given probability field simultaneously. This is important, because it means that we are not merely unable to define it's exact position/momentum, but that such discrete information about the particle does not actually exist (in other words, it doesn't actually have a position/momentum until we observe it, merely a probability field describing where it might be and what it could be doing there).
The key takeaway from all this is that it is not physically possible for the universe's future to be predetermined, and if it is not physically possible for the universe's future to be predetermined then it is not physically possible for someone (who isn't a vegetable) to have no free will, as they will inevitably be required to make more or less perfectly arbitrary decisions at some point by the probabilistic nature of the universe.
