From 63cb36ff52c0a6a0a6e0ceacd5f239e344d4f412 Mon Sep 17 00:00:00 2001
From: Enrico Tassi <enrico.tassi@inria.fr>
Date: Thu, 22 Nov 2007 16:58:04 +0000
Subject: [PATCH] lemma finisced

---
 matita/dama/valued_lattice.ma | 83 +++++++++++++++++++++++++++++++++--
 1 file changed, 80 insertions(+), 3 deletions(-)

diff --git a/matita/dama/valued_lattice.ma b/matita/dama/valued_lattice.ma
index ca30ddd0f..53855975d 100644
--- a/matita/dama/valued_lattice.ma
+++ b/matita/dama/valued_lattice.ma
@@ -30,7 +30,7 @@ record vlattice (R : ogroup) : Type ≝ {
   meet_wins1: ∀x,y. value (join x (meet x y)) ≈ value x;
   meet_wins2: ∀x,y. value (meet x (join x y)) ≈ value x;
   modular_mjp: ∀x,y. value (join x y) + value (meet x y) ≈ value x + value y;
-  join_meet_le: ∀x,y,z.  value (join x y) ≤ value (join x (meet y z));
+  join_meet_le: ∀x,y,z.  value (join x (meet y z)) ≤ value (join x y);
   meet_join_le: ∀x,y,z.  value (meet x y) ≤ value (meet x (join y z)) 
 }. 
 
@@ -90,7 +90,7 @@ qed.
 lemma modularmj: ∀R.∀L:vlattice R.∀x,y,z:L.μ(x∧(y∨z))≈(μx + μ(y ∨ z) + - μ(x∨(y∨z))).
 intros (R L x y z);
 lapply (modular_mjp ?? x (y ∨ z)) as H1;
-apply (eq_trans ?? (μ(x∨(y∨z))+ μ(x∧(y∨z)) +-μ(x∨(y∨z))) ?? H1); clear H1;
+apply (eq_trans ?? (μ(x∨(y∨z))+ μ(x∧(y∨z)) +-μ(x∨(y∨z)))); [2: apply feq_plusr; apply H1;] clear H1;
 apply (eq_trans ?? ? ?? (plus_comm ???));
 (* apply (eq_trans ?? (0+μ(x∧(y∧z))) ?? (opp_inverse ??)); ASSERT FALSE *)
 apply (eq_trans ?? (- μ(x∨(y∨z))+ μ(x∨(y∨z))+ μ(x∧(y∨z)))); [2: apply eq_sym; apply plus_assoc;]
@@ -100,6 +100,31 @@ apply (eq_trans ?? (μ(x∧(y∨z)))); [apply eq_reflexive]
 apply eq_sym; apply zero_neutral.
 qed.
 
+lemma modularjm: ∀R.∀L:vlattice R.∀x,y,z:L.μ(x∨(y∧z))≈(μx + μ(y ∧ z) + - μ(x∧(y∧z))).
+intros (R L x y z);
+lapply (modular_mjp ?? x (y ∧ z)) as H1;
+apply (eq_trans ?? (μ(x∧(y∧z))+ μ(x∨(y∧z)) +-μ(x∧(y∧z)))); [2: apply feq_plusr; apply (eq_trans ???? (plus_comm ???)); apply H1] clear H1;
+apply (eq_trans ?? ? ?? (plus_comm ???));
+apply (eq_trans ?? (- μ(x∧(y∧z))+ μ(x∧(y∧z))+ μ(x∨y∧z))); [2: apply eq_sym; apply plus_assoc]
+apply (eq_trans ?? (0+ μ(x∨y∧z))); [2: apply feq_plusr; apply eq_sym; apply opp_inverse]
+apply eq_sym; apply zero_neutral;
+qed.
+
+lemma step1_3_57': ∀R.∀L:vlattice R.∀x,y,z:L.
+  μ(x ∨ (y ∧ z)) ≈ (μ x) + (μ y) + μ z + -μ (y ∨ z) + -μ (z ∧ (x ∧ y)).
+intros (R L x y z);
+apply (eq_trans ?? ? ? (modularjm ?? x y z));
+apply (eq_trans ?? ( μx+ (μy+ μz+- μ(y∨z)) +- μ(x∧(y∧z))) ?); [
+  apply feq_plusr; apply feq_plusl; apply (modularm ?? y z);]
+apply (eq_trans ?? (μx+ μy+ μz+- μ(y∨z)+- μ(x∧(y∧z)))); [2:
+  apply feq_plusl; apply feq_opp;
+  apply (eq_trans ?? ? ? (meet_assoc ?????));
+  apply (eq_trans ?? ? ? (meet_comm ????));
+  apply eq_reflexive;]
+apply feq_plusr; apply (eq_trans ?? ? ? (plus_assoc ????));
+apply feq_plusr; apply plus_assoc;
+qed.
+
 lemma step1_3_57: ∀R.∀L:vlattice R.∀x,y,z:L.
   μ(x ∧ (y ∨ z)) ≈ (μ x) + (μ y) + μ z + -μ (y ∧ z) + -μ (z ∨ (x ∨ y)).
 intros (R L x y z);
@@ -115,7 +140,59 @@ apply feq_plusr; apply (eq_trans ?? ? ? (plus_assoc ????));
 apply feq_plusr; apply plus_assoc;
 qed.
 
-lemma meet_join_le1: ∀R.∀L:vlattice R.∀x,y,z:L.μ (x ∧ z) ≤ μ (x ∧ (y ∨ z)). 
+(* LEMMA 3.57 *) 
+
+lemma join_meet_le_join: ∀R.∀L:vlattice R.∀x,y,z:L.μ (x ∨ (y ∧ z)) ≤ μ (x ∨ z). 
+intros (R L x y z);
+apply (le_rewl ??? ? (eq_sym ??? (step1_3_57' ?????)));
+apply (le_rewl ??? (μx+ μy+ μz+- μ(y∨z)+ -μ(z∧x∧y))); [
+  apply feq_plusl; apply feq_opp; apply (eq_trans ?? ? ?? (eq_sym ??? (meet_assoc ?????))); apply eq_reflexive;]
+apply (le_rewl ??? (μx+ μy+ μz+- μ(y∨z)+ (- ( μ(z∧x)+ μy+- μ((z∧x)∨y))))); [
+  apply feq_plusl; apply feq_opp; apply eq_sym; apply modularm]
+apply (le_rewl ??? (μx+ μy+ μz+- μ(y∨z)+ (- μ(z∧x)+ -μy+-- μ((z∧x)∨y)))); [
+  apply feq_plusl; apply (eq_trans ?? (- (μ(z∧x)+ μy) + -- μ((z∧x)∨y))); [
+    apply feq_plusr; apply eq_sym; apply eq_opp_plus_plus_opp_opp;]
+  apply eq_sym; apply eq_opp_plus_plus_opp_opp;]
+apply (le_rewl ??? (μx+ μy+ μz+- μ(y∨z)+(- μ(z∧x)+- μy+ μ(y∨(z∧x))))); [
+  repeat apply feq_plusl; apply eq_sym; apply (eq_trans ?? (μ((z∧x)∨y)) ? (eq_opp_opp_x_x ??));
+  apply join_comm;]
+apply (le_rewl ??? (μx+ μy+ μz+- μ(y∨z)+(- μ(z∧x)+- μy)+ μ(y∨(z∧x)))); [
+  apply eq_sym; apply plus_assoc;]
+apply (le_rewl ??? (μx+ μy+ μz+- μ(y∨z)+(- μy + - μ(z∧x))+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; repeat apply feq_plusl; apply plus_comm;]
+apply (le_rewl ??? (μx+ μy+ μz+- μ(y∨z)+- μy + - μ(z∧x)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply eq_sym; apply plus_assoc;]
+apply (le_rewl ??? (μx+ μy+ μz+- μy + - μ(y∨z)+- μ(z∧x)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply (eq_trans ?? ? ?? (plus_assoc ????));
+  apply (eq_trans ?? ( μx+ μy+ μz+(- μy+- μ(y∨z))) ? (eq_sym ??? (plus_assoc ????)));
+  apply feq_plusl; apply plus_comm;]
+apply (le_rewl ??? (μx+ μy+ -μy+ μz + - μ(y∨z)+- μ(z∧x)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply (eq_trans ?? ? ?? (plus_assoc ????));
+  apply (eq_trans ?? (μx+ μy+( -μy+ μz)) ? (eq_sym ??? (plus_assoc ????)));
+  apply feq_plusl; apply plus_comm;]
+apply (le_rewl ??? (μx+ 0 + μz + - μ(y∨z)+- μ(z∧x)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply (eq_trans ?? ? ?? (plus_assoc ????));
+  apply feq_plusl; apply eq_sym; apply (eq_trans ?? ? ? (plus_comm ???));
+  apply opp_inverse; apply eq_reflexive;] 
+apply (le_rewl ??? (μx+ μz + - μ(y∨z)+- μ(z∧x)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply (eq_trans ?? ? ?? (plus_comm ???));
+  apply eq_sym; apply zero_neutral;]
+apply (le_rewl ??? (μz+ μx + - μ(y∨z)+- μ(z∧x)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply plus_comm;]
+apply (le_rewl ??? (μz+ μx +- μ(z∧x)+ - μ(y∨z)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply (eq_trans ?? ? ?? (plus_assoc ????));
+  apply (eq_trans ?? ? ? (eq_sym ??? (plus_assoc ????))); apply feq_plusl;
+  apply plus_comm;]
+apply (le_rewl ??? (μ(z∨x)+ - μ(y∨z)+ μ(y∨(z∧x)))); [
+  repeat apply feq_plusr; apply modularj;]
+apply (le_rewl ??? (μ(z∨x)+ (- μ(y∨z)+ μ(y∨(z∧x)))) (plus_assoc ????));
+apply (le_rewr ??? (μ(x∨z) + 0)); [apply (eq_trans ?? ? ? (plus_comm ???)); apply zero_neutral]
+apply (le_rewr ??? (μ(x∨z) + (-μ(y∨z) + μ(y∨z)))); [ apply feq_plusl; apply opp_inverse]
+apply (le_rewr ??? (μ(z∨x) + (-μ(y∨z) + μ(y∨z)))); [ apply feq_plusr; apply join_comm;]
+repeat apply fle_plusl; apply join_meet_le;
+qed.
+
+lemma meet_le_meet_join: ∀R.∀L:vlattice R.∀x,y,z:L.μ (x ∧ z) ≤ μ (x ∧ (y ∨ z)). 
 intros (R L x y z);
 apply (le_rewr ??? ? (eq_sym ??? (step1_3_57 ?????)));
 apply (le_rewr ??? (μx+ μy+ μz+- μ(y∧z)+ -μ(z∨x∨y))); [
-- 
2.39.2