X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=inline;f=matita%2Fmatita%2Flib%2Fturing%2Fmono.ma;h=1508c6c9eaf8a28580463d023c6155c53ab84e37;hb=637ff9311e16f1d58e03d873f84c354e1cf1e716;hp=bab3ab1ba067d1e1c23665fc6924def2603a176b;hpb=3f37ee83ce3c43f34d38729d192e72510f998a53;p=helm.git

diff --git a/matita/matita/lib/turing/mono.ma b/matita/matita/lib/turing/mono.ma
index bab3ab1ba..1508c6c9e 100644
--- a/matita/matita/lib/turing/mono.ma
+++ b/matita/matita/lib/turing/mono.ma
@@ -134,6 +134,16 @@ definition step ≝ λsig.λM:TM sig.λc:config sig (states sig M).
   let 〈news,a,mv〉 ≝ trans sig M 〈cstate ?? c,current_char〉 in
   mk_config ?? news (tape_move sig (tape_write ? (ctape ?? c) a) mv).
 
+(*
+lemma step_eq : ∀sig,M,c. 
+  let current_char ≝ current ? (ctape ?? c) in
+  let 〈news,a,mv〉 ≝ trans sig M 〈cstate ?? c,current_char〉 in
+  step sig M c = 
+    mk_config ?? news (tape_move sig (tape_write ? (ctape ?? c) a) mv).
+#sig #M #c  
+ whd in match (tape_move_mono sig ??);
+*)
+  
 (******************************** loop ****************************************)
 let rec loop (A:Type[0]) n (f:A→A) p a on n ≝
   match n with