Hi all, On Feb 11, 2008 3:14 PM, apfelmus <[EMAIL PROTECTED]> wrote: > I will be mean by asking the following counter question: > > x + (y + z) = (x + y) + z > > is a mathematical identity. If it is a mathematical identity, a > programmer need not care about this law to implement addition + . Can > anyone give me an example implementation of addition that violates this law?
Depends on what you mean by "addition". In general, algebraists call any associative and commutative operation on a set "addition", and nothing else. From that POV, there is by definition no "addition" that violates this law. Arnar _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
