X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Flambda%2Frc_sat.ma;h=3eb04315f4f471a07e314b14086a574dc1cc0067;hb=fc7af5f9ea2cd4a876b8babc6b691136799e3c87;hp=4e15b07d3124fd5d588aa55211390301b6b9ffe4;hpb=f3091151495bc605ce2022e55741f6420f708d8e;p=helm.git

diff --git a/matita/matita/lib/lambda/rc_sat.ma b/matita/matita/lib/lambda/rc_sat.ma
index 4e15b07d3..3eb04315f 100644
--- a/matita/matita/lib/lambda/rc_sat.ma
+++ b/matita/matita/lib/lambda/rc_sat.ma
@@ -33,6 +33,7 @@ record RC : Type[0] ≝ {
    sat3: SAT3 mem;  (* we add the clusure by rev dapp *)
    sat4: SAT4 mem   (* we add the clusure by dummies *) 
 }.
+
 (* HIDDEN BUG:
  * if SAT0 and SAT1 are expanded,
  * the projections sat0 and sat1 are not generated
@@ -114,12 +115,12 @@ lemma nth_repl: ∀C1,C2. C1 ≅ C2 → ∀i,l1,l2. l1 ≅ l2 →
 #C1 #C2 #QC #i (elim i) /3/
 qed.
 *)
-(* the r.c for a (dependent) product type. ************************************)
+(* the r.c. for a (dependent) product type. ***********************************)
 
 definition dep_mem ≝ λB,C,M. ∀N. N ∈ B → App M N ∈ C.
 
 lemma dep_cr1: ∀B,C. CR1 (dep_mem B C).
-#B #C #M #Hdep (lapply (Hdep (Sort 0) ?)) /2 by SAT0_sort/ /3/ (**) (* adiacent auto *)
+#B #C #M #Hdep (lapply (Hdep (Sort 0) ?)) -Hdep /3/ @SAT0_sort //
 qed.
 
 lemma dep_sat0: ∀B,C. SAT0 (dep_mem B C).
@@ -134,7 +135,7 @@ lemma dep_sat2: ∀B,C. SAT2 (dep_mem B C).
 qed.
 
 lemma dep_sat3: ∀B,C. SAT3 (dep_mem B C).
-#B #C #N #l1 #l2 #HN #M #HM <appl_append >associative_append /3/
+#B #C #M #N #l #H #L #HL <appl_append @sat3 /2/
 qed.
 
 lemma dep_sat4: ∀B,C. SAT4 (dep_mem B C).
@@ -149,3 +150,32 @@ lemma dep_repl: ∀B1,B2,C1,C2. B1 ≅ B2 → C1 ≅ C2 →
 #B1 #B2 #C1 #C2 #QB #QC #M @conj #H1 #N #H2
 [ lapply (symmetric_rceq … QB) -QB | lapply (symmetric_rceq … QC) -QC ] /4/
 qed.
+
+(* the union of two r.c.'s. ***************************************************)
+
+definition lor_mem ≝ λB,C,M. M ∈ B ∨ M ∈ C.
+
+lemma lor_cr1: ∀B,C. CR1 (lor_mem B C).
+#B #C #M #Hlor elim Hlor -Hlor #HM /2/
+qed.
+
+lemma lor_sat0: ∀B,C. SAT0 (lor_mem B C).
+/3/ qed.
+
+lemma lor_sat1: ∀B,C. SAT1 (lor_mem B C).
+/3/ qed.
+
+lemma lor_sat2: ∀B,C. SAT2 (lor_mem B C).
+#B #C #N #L #M #l #HN #HL #HM elim HM -HM #HM /3/
+qed.
+
+lemma lor_sat3: ∀B,C. SAT3 (lor_mem B C).
+#B #C #N #l1 #l2 #HN elim HN -HN #HN /3/
+qed.
+
+lemma lor_sat4: ∀B,C. SAT4 (lor_mem B C).
+#B #C #N #HN elim HN -HN #HN /3/
+qed.
+
+definition lorRC: RC → RC → RC ≝ λB,C. mk_RC (lor_mem B C) ….
+/2/ qed.