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The `Set' type

Our implementation of sets (key property: no duplicates) is just a variant of the `FiniteMap' module.
data Set        -- abstract
                -- instance of: Eq

emptySet        :: Set a
mkSet           :: Ord a => [a]  -> Set a
setToList       :: Set a -> [a]
unitSet         :: a -> Set a
singletonSet    :: a -> Set a  -- deprecated, use unitSet.

union           :: Ord a => Set a -> Set a -> Set a
unionManySets   :: Ord a => [Set a] -> Set a
minusSet        :: Ord a => Set a -> Set a -> Set a
mapSet          :: Ord a => (b -> a) -> Set b -> Set a
intersect       :: Ord a => Set a -> Set a -> Set a

elementOf       :: Ord a => a -> Set a -> Bool
isEmptySet      :: Set a -> Bool

cardinality     :: Set a -> Int


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