arithmetics for λδ

[helm.git] / matita / matita / contribs / lambdadelta / ground / arith / nat_pred_succ.ma

diff --git a/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma b/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma
index 71e5e921fd48558b7f890ba5b3bdfdddeabafcc2..a9a3ecd083e75801f0916497754cc10be3871368 100644 (file)
--- a/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma
+++ b/matita/matita/contribs/lambdadelta/ground/arith/nat_pred_succ.ma
@@ -15,11 +15,11 @@
 include "ground/arith/nat_succ.ma".
 include "ground/arith/nat_pred.ma".
 
-(* NON-NEGATIVE INTEGERS ****************************************************)
+(* PREDECESSOR FOR NON-NEGATIVE INTEGERS ************************************)
 
-(* Basic rewrites with succ *************************************************)
+(* Constructions with nsucc *************************************************)
 
-(*** pred_Sn *)
+(*** pred_Sn pred_S *)
 lemma npred_succ (n): n = ↓↑n.
 * //
 qed.