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Talk:Peano numbers

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Theoretically speaking, the numbers defined here are not Peano numbers. As far as I know it is difficult, if not impossible, to define such inductive types in Haskell. In particular, infinity is included in this type (as infinite lists are included in the list type). (Sorry for my imprecise languages here.) People who are looking for formal, theoretical foundation should take this Wiki page with a pinch of salt. --Favonia 02:27, 30 May 2011 (UTC)