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July 25th, 2014, 01:21 PM  #1 
Newbie Joined: Jul 2014 From: UK Posts: 2 Thanks: 0  Series expansion of the signum function of sine
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. 
July 25th, 2014, 01:25 PM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms 
I dunno, kind of like this? Fourier SeriesSquare Wave  from Wolfram MathWorld 
July 26th, 2014, 12:11 AM  #3 
Newbie Joined: Jul 2014 From: UK Posts: 2 Thanks: 0 
Thanks.


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