Re: [Haskell-cafe] Why monoids will abide...

See, that's the kind of name we need! StructureWithAssociativeOperationAndIdentity -- make both the mathematicians AND the non-mathematicians mad! On Thu, Jan 22, 2009 at 9:53 AM, Dan Piponi wrote:

On Wed, Jan 21, 2009 at 11:12 PM, Eugene Kirpichov wrote:

...

To my mind, in the map-reduce case you generally need a commutative monoid. Or, you need an extra infrastructure that mappend's only results from adjacent machines, or something like that.

This is a good paper on the stuff I'm talking about: http://citeseer.ist.psu.edu/blelloch90prefix.html It doesn't explicitly mention monoids but it's all about associative operations with identity. -- Dan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe