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  1. #  infprod(y,x) gives a infinit product of y from 1 (or 2) to infinity.
  2. #  e.g. infprod(1-1/n^2) gives 1/2
  3.  
  4. infprod(1-1/n_^2) := 1/2
  5. infprod(1-1/(4*n_^2)) := 2/pi
  6.