X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground_2%2Fsteps%2Frtc_max.ma;h=46f457536456d6e034d544f3e4c1e604101bb6e0;hb=89ea663d91904f483f8248cfaeaed5eda8715da2;hp=1c8861fa89c239582dd8074ff06a363af8b4fa56;hpb=9a6cf8c3b53fe33515acd1aef8e7c7a10d71ae71;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_max.ma b/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_max.ma
index 1c8861fa8..46f457536 100644
--- a/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_max.ma
+++ b/matita/matita/contribs/lambdadelta/ground_2/steps/rtc_max.ma
@@ -36,6 +36,10 @@ lemma max_O_dx: ∀c. c = (c ∨ 𝟘𝟘).
 * #ri #rs #ti #ts <max_rew //
 qed.
 
+lemma max_idem: ∀c. c = (c ∨ c).
+* #ri #rs #ti #ts <max_rew //
+qed.
+
 (* Basic inversion properties ***********************************************)
 
 lemma max_inv_dx: ∀ri,rs,ti,ts,c1,c2. 〈ri,rs,ti,ts〉 = (c1 ∨ c2) →
@@ -46,6 +50,13 @@ lemma max_inv_dx: ∀ri,rs,ti,ts,c1,c2. 〈ri,rs,ti,ts〉 = (c1 ∨ c2) →
 <max_rew #H destruct /2 width=14 by ex6_8_intro/
 qed-.
 
+(* Main Properties **********************************************************)
+
+theorem max_assoc: associative … max.
+* #ri1 #rs1 #ti1 #ts1 * #ri2 #rs2 #ti2 #ts2 * #ri3 #rs3 #ti3 #ts3
+<max_rew <max_rew //
+qed.
+
 (* Properties with test for constrained rt-transition counter ***************)
 
 lemma isrt_max: ∀n1,n2,c1,c2. 𝐑𝐓⦃n1, c1⦄ → 𝐑𝐓⦃n2, c2⦄ → 𝐑𝐓⦃n1∨n2, c1∨c2⦄.
@@ -76,9 +87,8 @@ lapply (isrt_mono … Hn2 H2) -c2 #H destruct //
 qed-.
 
 (* Properties with shift ****************************************************)
-(*
-lemma max_shift: ∀c1,c2. (↓c1) ∨ (↓c2) = ↓(c1∨c2).
+
+lemma max_shift: ∀c1,c2. ((↓c1) ∨ (↓c2)) = ↓(c1∨c2).
 * #ri1 #rs1 #ti1 #ts1 * #ri2 #rs2 #ti2 #ts2
 <shift_rew <shift_rew <shift_rew <max_rew //
 qed.
-*)