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How can I prove peroidic of state of simple harmonic

  1. Sep 14, 2009 #1
    Hi
    How can I prove peroidic of state of simple harmonic

    Y(x)=exp(iwt/2 sum(Cn Un (x) exp(-iwnt) )
     
  2. jcsd
  3. Sep 14, 2009 #2

    berkeman

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    Staff: Mentor

    Re: periodic

    Welcome to the PF. How would you usually approach proving that a function was periodic?
     
  4. Sep 16, 2009 #3
    Re: periodic

    I usually use f(x+t)=f(x), but here I am not sure how can I prove it.
     
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