2009/11/13 Rafael Gustavo da Cunha Pereira Pinto <rafaelgcpp.li...@gmail.com>: > > Monoid is the category of all types that have a empty value and an append > operation. >
Or more generally a neutral element and an associative operation: The multiplication monoid (1,*) 9*1*1*1 = 9 1 is neutral but you might be hard pressed to consider it _empty_. Best wishes Stephen _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
