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[The Theoretical Minimum] Can closed systems exist?
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[QUOTE="mfb, post: 6000994, member: 405866"] Right. As an example: If you want to describe the orbit of planets in the solar system, it is sufficient to consider the solar system. There are gravitational interactions with other objects (with all objects in the observable universe, even), but they are negligible.That is a different case - where you use physical laws that are only approximations. Closed vs. open systems are not a statement about the laws used, they are properties of the systems. [/QUOTE]
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[The Theoretical Minimum] Can closed systems exist?
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