X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Frelocation%2Frtmap_pushs.ma;h=5c43f1872fd2d38c283303613bcf03dc8271572c;hp=420143933390124d7079b2ea639b54b7f59d22d4;hb=8fdf1af656038d0245eba64ff2531bbe94ce0e9e;hpb=77c9255de3c5f7780aeacd745703a1cc76328a68

diff --git a/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_pushs.ma b/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_pushs.ma
index 420143933..5c43f1872 100644
--- a/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_pushs.ma
+++ b/matita/matita/contribs/lambdadelta/ground/relocation/rtmap_pushs.ma
@@ -13,20 +13,42 @@
 (**************************************************************************)
 
 include "ground/notation/functions/upspoonstar_2.ma".
+include "ground/arith/nat_succ_iter.ma".
 include "ground/relocation/rtmap_eq.ma".
 
 (* RELOCATION MAP ***********************************************************)
 
-rec definition pushs (f:rtmap) (n:nat) on n: rtmap ≝ match n with
-[ O ⇒ f | S m ⇒ ⫯(pushs f m) ].
+definition pushs (f:rtmap) (n:nat) ≝ push^n f.
 
 interpretation "pushs (rtmap)" 'UpSpoonStar n f = (pushs f n).
 
+(* Basic properties *********************************************************)
+
+lemma pushs_O: ∀f. f = ⫯*[𝟎] f.
+// qed.
+
+lemma pushs_S: ∀f,n. ⫯⫯*[n] f = ⫯*[↑n] f.
+#f #n @(niter_succ … push)
+qed.
+
+lemma pushs_eq_repl: ∀n. eq_repl (λf1,f2. ⫯*[n] f1 ≡ ⫯*[n] f2).
+#n @(nat_ind_succ … n) -n /3 width=5 by eq_push/
+qed.
+
+(* Advanced properties ******************************************************)
+
+lemma push_swap (n) (f):  ⫯⫯*[n] f = ⫯*[n] ⫯f.
+#n #f @(niter_appl … push)
+qed.
+
+lemma pushs_xn: ∀n,f. ⫯*[n] ⫯f = ⫯*[↑n] f.
+// qed.
+
 (* Basic_inversion lemmas *****************************************************)
 
 lemma eq_inv_pushs_sn: ∀n,f1,g2. ⫯*[n] f1 ≡ g2 →
                        ∃∃f2. f1 ≡ f2 & ⫯*[n] f2 = g2.
-#n elim n -n /2 width=3 by ex2_intro/
+#n @(nat_ind_succ … n) -n /2 width=3 by ex2_intro/
 #n #IH #f1 #g2 #H elim (eq_inv_px … H) -H [|*: // ]
 #f0 #Hf10 #H1 elim (IH … Hf10) -IH -Hf10 #f2 #Hf12 #H2 destruct
 /2 width=3 by ex2_intro/
@@ -34,26 +56,8 @@ qed-.
 
 lemma eq_inv_pushs_dx: ∀n,f2,g1. g1 ≡ ⫯*[n] f2 →
                        ∃∃f1. f1 ≡ f2 & ⫯*[n] f1 = g1.
-#n elim n -n /2 width=3 by ex2_intro/
+#n @(nat_ind_succ … n) -n /2 width=3 by ex2_intro/
 #n #IH #f2 #g1 #H elim (eq_inv_xp … H) -H [|*: // ]
 #f0 #Hf02 #H1 elim (IH … Hf02) -IH -Hf02 #f1 #Hf12 #H2 destruct
 /2 width=3 by ex2_intro/
 qed-.
-
-(* Basic properties *********************************************************)
-
-lemma pushs_O: ∀f. f = ⫯*[0] f.
-// qed.
-
-lemma pushs_S: ∀f,n. ⫯⫯*[n] f = ⫯*[↑n] f.
-// qed.
-
-lemma pushs_eq_repl: ∀n. eq_repl (λf1,f2. ⫯*[n] f1 ≡ ⫯*[n] f2).
-#n elim n -n /3 width=5 by eq_push/
-qed.
-
-(* Advanced properties ******************************************************)
-
-lemma pushs_xn: ∀n,f. ⫯*[n] ⫯f = ⫯*[↑n] f.
-#n elim n -n //
-qed.