Past events determine, or at least constrain, future events. Because other events are too far away in space-time, only a subset of past events affects an event. In phase spaces, past states determine, or at least constrain, future states {consistent histories}. Because other states are too far away in phase space, only a subset of past states affects a state. In most systems, most states do not affect a future state. In quantum mechanics, systems have an infinite number of different consistent histories, each with a probability. Without quantum mechanics, completely determined systems have one consistent history.
Physical Sciences>Physics>Quantum Mechanics>States
5-Physics-Quantum Mechanics-States
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Date Modified: 2022.0224