You mean monoids right? :-) On Wed, Jan 21, 2009 at 1:30 AM, Eugene Kirpichov <[email protected]>wrote:
> Wow. This is a cool point of view on monads, thank you for > enlightening (the arrow stuff is yet too difficult for me to > understand)! > > 2009/1/21 Andrzej Jaworski <[email protected]>: > > Monads are monoids in categories of functors C -> C Arrows are monoids in > > subcategories of bifunctors (C^op) x C -> C Trees are a playing ground > for > > functors in general:-) > > > > _______________________________________________ > > Haskell-Cafe mailing list > > [email protected] > > http://www.haskell.org/mailman/listinfo/haskell-cafe > > > _______________________________________________ > Haskell-Cafe mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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