> let zipWithPlus = zipWith (+)
zipWithPlus :: [Integer] -> [Integer] -> [Integer]

Why isn't it:  (Num a)  => a -> a-> a
  I was unable to find a way to get the type to be more general.  I tried various declarations within the let using (Num a)  => a -> a-> a but none of them were accepted.

Thanks.
-- Russ Abbott
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  Professor, Computer Science
  California State University, Los Angeles

  Google voice: 424-242-USA0 (last character is zero)
  blog: http://russabbott.blogspot.com/
  vita:  http://sites.google.com/site/russabbott/
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