X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_paramodulation%2Findex.ml;h=4db4584a451494caf00bff8166a3a37f96d678dc;hb=c6c248e635ef35e9515ed981374ce2a0cef30e62;hp=5c085c5188db5a4473337995e167d17b290f5bfe;hpb=50ed5ab75a38693c7b7558ca9487998e81bb7f89;p=helm.git

diff --git a/helm/software/components/ng_paramodulation/index.ml b/helm/software/components/ng_paramodulation/index.ml
index 5c085c518..4db4584a4 100644
--- a/helm/software/components/ng_paramodulation/index.ml
+++ b/helm/software/components/ng_paramodulation/index.ml
@@ -80,12 +80,6 @@ module Index(B : Orderings.Blob) = struct
       type data = ClauseSet.elt and 
       type dataset = ClauseSet.t
     = Make(FotermIndexable)(ClauseSet)
-
-  let are_invertible maxvar varlist l r =
-    let _,_,subst = U.relocate maxvar varlist FoSubst.id_subst in
-    let l = FoSubst.apply_subst subst l in
-      try (ignore(Unif.alpha_eq l r);true) with
-	  FoUnif.UnificationFailure _ -> false
   
   let index_unit_clause maxvar t = function
     | (_,Terms.Equation (l,_,_,Terms.Gt),_,_) as c -> 
@@ -93,14 +87,16 @@ module Index(B : Orderings.Blob) = struct
     | (_,Terms.Equation (_,r,_,Terms.Lt),_,_) as c -> 
           DT.index t r (Terms.Right2Left, c)
     | (_,Terms.Equation (l,r,_,Terms.Incomparable),vl,_) as c ->
-	if are_invertible maxvar vl l r then
+(*	if are_invertible maxvar vl l r then
 	  (prerr_endline ("Invertible " ^ (Pp.pp_foterm l) ^ "=" ^
 	     (Pp.pp_foterm r));
            DT.index t l (Terms.Left2Right, c))
-	   else
+	   else *)
           DT.index  
            (DT.index t l (Terms.Left2Right, c))
            r (Terms.Right2Left, c)
+    | (_,Terms.Equation (l,r,_,Terms.Invertible),vl,_) as c ->
+	DT.index t l (Terms.Left2Right, c)
     | (_,Terms.Equation (_,r,_,Terms.Eq),_,_)  -> assert false
     | (_,Terms.Predicate p,_,_) as c ->
           DT.index t p (Terms.Nodir, c)