X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Farith%2Fnat_succ_iter.ma;h=29e3e4d4faa0a2793cf0ae8de688475ad4290005;hb=873fb39bdd21aa14877bf5d50db26e3a050c6d43;hp=7f47f9158fd05d3ecd8651079bafed31db362f4d;hpb=888840f6b3a71d3d686b53b702d362ab90ab0038;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 7f47f9158..29e3e4d4f 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): f ∘ f^n ≐ f^{A}(↑n).
+lemma niter_succ (A) (f) (n): f ∘ f^n ⊜ f^{A}(↑n).
 #A #f * //
 qed.