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Series expansion of the signum function of sine

  1. Jul 25, 2014 #1
    Hi,

    I just read a physics paper and there it expands signum of a sine function as below:


    sgn(sin(wt))=(4/pi)*{sin(wt)+(1/3)*sin(3wt)+(1/5)*sin(5wt)+.......}

    How can we expand sgn(sin(wt)) like this?

    Thanks.
     
  2. jcsd
  3. Jul 25, 2014 #2

    jbunniii

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