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The Physical Basis of the Direction of Time

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we go any further, it's important to get a clear idea of what time reversal symmetry really means. At the simplest level, we may think of the laws of physics as equations involving a time variable , and say that they are symmetric under time reversal if given any solution, and making the substitution , we obtain another solution.



What does t (and - t) stand for in physics ?


only time ?

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You may also mean an affine parameter, which may play the role of "Newtonian" time or simply parametrise a curve or family of objects. Depends on the context.

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