Question

Is there another way to do this function without the use haskell functions

    mymin :: (Ord a) => [a] -> a 
    mymin [] = error "empty list"
    mymin [x] = x  
    mymin (x:xs)   
          | x < mt = x  
          | otherwise = mt  
            where mt = mymin xs

and tell me what does mymin :: (Ord a) => [a] ->a mean?

Answer 1

Since AndrewC already explained what mymin :: Ord a => [a] -> a means. An alternative function could be :

mymin :: (Ord a) => [a] -> a 
mymin [] = error "empty list"
mymin [x] = x  
mymin (x:y:xs) = if x < y then mymin(x:xs) else mymin(y:xs)

or

mymin :: (Ord a) => [a] -> a 
mymin [] = error "empty list"
mymin [x] = x  
mymin (x:y:xs) = mymin ((if x < y then x else y):xs)