On Fri, 29 Jul 2011, Conal Elliott wrote:

Is there a collection of laws associated with the Foldable class? Or for 
Traversable?  - Conal

Recently I asked the same question:
  http://www.haskell.org/pipermail/libraries/2011-June/016429.html

and got the answer:
  http://www.cs.ox.ac.uk/jeremy.gibbons/publications/iterator.pdf

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