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Wave Equation Problem

  1. May 28, 2009 #1
    1. The problem statement, all variables and given/known data


    Prove that, for any solution to the wave equation, the sum of the values of phi at the points (x0,ct0 +- a) is equal to the sum of the values of phi at the points (x0 +- a,ct0). Prove this directly from the wave equation, not from the general solution.

    Hint: change co-ordinates u=x-ct and v=x+ct, then integrate twice



    3. The attempt at a solution

    I have no idea how to use the substitution!!! help!



    The +- is meant to be + on top of -.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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