Hi,

On Jul 29, 2011, at 10:15 PM, Conal Elliott wrote:

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

if you are not aware of "The essence of the Iterator pattern" by Jeremy Gibbons 
and Bruno Oliveira 
(http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.136.850&rep=rep1&type=pdf)
 it might be interesting. Especially chapter 5 discusses some laws of 
traversable instances.

Cheers, Jan
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