X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_succ_iter.ma;h=7f47f9158fd05d3ecd8651079bafed31db362f4d;hb=888840f6b3a71d3d686b53b702d362ab90ab0038;hp=63031d93599d1eed24d94dfcd9d0286715cdb38b;hpb=21de0d35017656c5a55528390b54b0b2ae395b44;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/nat_succ_iter.ma b/matita/matita/contribs/lambdadelta/ground/arith/nat_succ_iter.ma
index 63031d935..7f47f9158 100644
--- a/matita/matita/contribs/lambdadelta/ground/arith/nat_succ_iter.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/nat_succ_iter.ma
@@ -20,6 +20,6 @@ include "ground/arith/nat_succ.ma".
 (* Constructions with niter *************************************************)
 
 (*** iter_S *)
-lemma niter_succ (A) (f) (n) (a): f (f^n a) = f^{A}(↑n) a.
+lemma niter_succ (A) (f) (n): f ∘ f^n ≐ f^{A}(↑n).
 #A #f * //
 qed.