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diff --git a/helm/software/matita/dama/ordered_divisible_group.ma b/helm/software/matita/dama/ordered_divisible_group.ma
index cae552114..a6c13e189 100644
--- a/helm/software/matita/dama/ordered_divisible_group.ma
+++ b/helm/software/matita/dama/ordered_divisible_group.ma
@@ -32,19 +32,19 @@ qed.
 
 coercion cic:/matita/ordered_divisible_group/todg_division.con.
 
-lemma pow_ge: ∀G:todgroup.∀x:G.∀n.0 ≤ x → 0 ≤ n * x.
+lemma mul_ge: ∀G:todgroup.∀x:G.∀n.0 ≤ x → 0 ≤ n * x.
 intros (G x n); elim n; simplify; [apply le_reflexive]
 apply (le_transitive ???? H1); 
 apply (le_rewl ??? (0+(n1*x)) (zero_neutral ??));
 apply fle_plusr; assumption;
 qed. 
 
-lemma lt_ltpow: ∀G:todgroup.∀x,y:G.∀n. x < y → S n * x < S n * y.
+lemma lt_ltmul: ∀G:todgroup.∀x,y:G.∀n. x < y → S n * x < S n * y.
 intros; elim n; [simplify; apply flt_plusr; assumption]
 simplify; apply (ltplus); [assumption] assumption;
 qed.
 
-lemma ltpow_lt: ∀G:todgroup.∀x,y:G.∀n. S n * x < S n * y → x < y.
+lemma ltmul_lt: ∀G:todgroup.∀x,y:G.∀n. S n * x < S n * y → x < y.
 intros 4; elim n; [apply (plus_cancr_lt ??? 0); assumption]
 simplify in l; cases (ltplus_orlt ????? l); [assumption]
 apply f; assumption;
@@ -53,16 +53,16 @@ qed.
 lemma divide_preserves_lt: ∀G:todgroup.∀e:G.∀n.0<e → 0 < e/n.
 intros; elim n; [apply (lt_rewr ???? (div1 ??));assumption]
 unfold divide; elim (dg_prop G e (S n1)); simplify; simplify in f;
-apply (ltpow_lt ??? (S n1)); simplify; apply (lt_rewr ???? f);
+apply (ltmul_lt ??? (S n1)); simplify; apply (lt_rewr ???? f);
 apply (lt_rewl ???? (zero_neutral ??)); 
 apply (lt_rewl ???? (zero_neutral ??)); 
-apply (lt_rewl ???? (powzero ?n1));
+apply (lt_rewl ???? (mulzero ?n1));
 assumption;
 qed.
 
-lemma poweqplus_lt: ∀G:todgroup.∀x,y:G.∀n,m.
+lemma muleqplus_lt: ∀G:todgroup.∀x,y:G.∀n,m.
    0<x → 0<y → S n * x ≈ S (n + S m) * y → y < x.
-intros (G x y n m H1 H2 H3); apply (ltpow_lt ??? n); apply (lt_rewr ???? H3);
+intros (G x y n m H1 H2 H3); apply (ltmul_lt ??? n); apply (lt_rewr ???? H3);
 clear H3; elim m; [
   rewrite > sym_plus; simplify; apply (lt_rewl ??? (0+(y+n*y))); [
     apply eq_sym; apply zero_neutral]