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In most dynamics books I've read they refer to conservation laws and their associated symmetries, cf. Noether's theorem. I know that

  • the conservation of momentum is a result of the homogenity of space
  • angular momentum is the result of isotropic space
  • and the conservation of energy is the result of the homogenity of time.

Is there a fourth conservation law that would result from time-reversal symmetry?

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