X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Ftutorial%2Fchapter13.ma;h=1971b956ee9421eaac258dadf5c5512253e7032b;hb=836e4f30514bceb27394604bbfbae31a62723dae;hp=3ff16855e67af8e6aeff2641480cebeb2ee79cad;hpb=636db4e12452d2ebce318b36cf5c41d30e4d9c29;p=helm.git

diff --git a/matita/matita/lib/tutorial/chapter13.ma b/matita/matita/lib/tutorial/chapter13.ma
index 3ff16855e..1971b956e 100644
--- a/matita/matita/lib/tutorial/chapter13.ma
+++ b/matita/matita/lib/tutorial/chapter13.ma
@@ -104,8 +104,7 @@ coercion R_to_fun : ∀r:R. ℕ → Q ≝ r on _r:R to ?.
 (* Adding two real numbers just requires pointwise addition of the 
  approximations. The proof that the resulting sequence is Cauchy is the standard
  one: to obtain an approximation up to eps it is necessary to approximate both
- summands up to eps/2. The proof that the function is well defined w.r.t. the
- omitted equivalence relation is also omitted. *)
+ summands up to eps/2. *)
 definition Rplus_: R_ → R_ → R_ ≝
  λr1,r2. mk_R_ (λn. r1 n + r2 n) ….
  #eps
@@ -156,7 +155,7 @@ record div_trace: Type[0] ≝
  ; div_well_formed: ∀n. next (div_tr n) (div_tr (S n))
  }.
 
-(* The previous definition of trace is not very computable: we cannot write
+(* The previous definition of trace is not computable: we cannot write
  a program that given an initial state returns its trace. To write that function,
  we first write a computable version of next, called step. *)
 definition step: state → option state ≝