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+(* Test robustness of Groebner tactic in presence of disequalities *)
+
+Require Export Reals.
+Require Export NsatzR.
+
+Open Scope R_scope.
+
+Lemma essai :
+ forall yb xb m1 m2 xa ya,
+  xa <> xb ->
+ yb - 2 * m2 * xb = ya - m2 * xa -> 
+ yb - m1 * xb = ya - m1 * xa ->
+ yb - ya = (2 * xb - xa) * m2 -> 
+ yb - ya = (xb - xa) * m1.
+Proof.
+intros.
+(* clear H. groebner used not to work when H was not cleared *)
+nsatzR.
+Qed.
+