Theorem.hs


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module Theorem (
	Theorem(..),

	nullThm
	) where


import qualified Data.Set as Set
import TypeVar
import Term


data Theorem = Theorem { thmHyp :: Set.Set Term
                       , thmCon :: Term } deriving (Eq, Ord)


instance Show Theorem where
    show a   =   (show . Set.toList . thmHyp $ a) ++ " |- " ++ (show . thmCon $ a)


nullThm :: Theorem
nullThm = Theorem Set.empty nullTerm