Hi all, I am interested in interval arithmetic. Does anyone know something about haskell implementations in this domain? It would be nice to have a datatype Interval with the elementary operations {+,-,*,/}, where >+ :: Intervall -> Intervall -> Intervall >(a,b) + (c,d) = (a+c,b+d) >- :: Intervall -> Intervall -> Intervall >(a,b) - (c,d) = (a-d,b-c) etc. Bye Jonas