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What's the physical meaning of advanced and retared waves?

  1. Mar 12, 2004 #1
    thx a lot,
  2. jcsd
  3. Mar 12, 2004 #2


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    Direction of time in which the waves propagate (I'm guessing you aluded to time in your post)
    "Retarded" means backwards in time.
    Nothing else than another formalism evolved from the time equation symetry.
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