bracaman wrote: > If you can use elem :: Eq a => a -> [a] -> Bool function, you can do: > > f x l= or (map (elem x) l > > On Thursday 07 February 2002 20:17, you wrote: > > hi,how do I define a function to test whether a number > > is an element of a list of lists of numbers. > > > > elem :: Int -> [[Int]] -> Bool I prefer f x l = x `elem` concat l - Zhanyong Wan