+ let index_unit_clause t = function
+ | (_,Terms.Equation (l,_,_,Terms.Gt),_,_) as c ->
+ DT.index t l (Terms.Left2Right, c)
+ | (_,Terms.Equation (_,r,_,Terms.Lt),_,_) as c ->
+ DT.index t r (Terms.Right2Left, c)
+ | (_,Terms.Equation (l,r,_,Terms.Incomparable),_,_) as c ->
+ DT.index
+ (DT.index t l (Terms.Left2Right, c))
+ r (Terms.Right2Left, c)
+ | (_,Terms.Equation (_,r,_,Terms.Eq),_,_) -> assert false
+ | (_,Terms.Predicate p,_,_) as c ->
+ DT.index t p (Terms.Nodir, c)
+ ;;
+
+ type active_set = B.t Terms.unit_clause list * DT.t
+