X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_paramodulation%2Fterms.ml;h=9a225fd27b2807f3a3ea37d57276eb93332e384a;hb=016f069da6221053873b4d505716ef1bd80f08b6;hp=169d19b80b68a52d0eb062162464e451a96a5757;hpb=b69275324ae2d436f2f4dbb70e0ddcbdf3886636;p=helm.git

diff --git a/helm/software/components/ng_paramodulation/terms.ml b/helm/software/components/ng_paramodulation/terms.ml
index 169d19b80..9a225fd27 100644
--- a/helm/software/components/ng_paramodulation/terms.ml
+++ b/helm/software/components/ng_paramodulation/terms.ml
@@ -47,6 +47,14 @@ type 'a unit_clause =
 type 'a passive_clause = int * 'a unit_clause (* weight * equation *)
 
 
+let vars_of_term t =
+  let rec aux acc = function
+    | Leaf _ -> acc
+    | Var i -> if (List.mem i acc) then acc else i::acc
+    | Node l -> List.fold_left aux acc l
+  in aux [] t
+;;
+
 module OT =
  struct
    type t = int