X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fground%2Flib%2Fltc.ma;h=57ecbbf2cc2c93ad2c1c8d99493743bdc249ce13;hb=55c768d7e45babb300b5010463ba3196a68f1bbe;hp=9c2e12a7a5884231bec92e7d7cfad5f73b1015f7;hpb=15212e44902f25536f6e2de4bec4cedcd9a9804d;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/ground/lib/ltc.ma b/matita/matita/contribs/lambdadelta/ground/lib/ltc.ma
index 9c2e12a7a..57ecbbf2c 100644
--- a/matita/matita/contribs/lambdadelta/ground/lib/ltc.ma
+++ b/matita/matita/contribs/lambdadelta/ground/lib/ltc.ma
@@ -24,20 +24,23 @@ inductive ltc (A:Type[0]) (f) (B) (R:relation3 A B B): relation3 A B B ≝
 
 (* Basic constructions ******************************************************)
 
-lemma ltc_sn (A) (f) (B) (R): ∀a1,b1,b. R a1 b1 b →
-                              ∀a2,b2. ltc A f B R a2 b b2 → ltc … f … R (f a1 a2) b1 b2.
+lemma ltc_sn (A) (f) (B) (R):
+      ∀a1,b1,b. R a1 b1 b →
+      ∀a2,b2. ltc A f B R a2 b b2 → ltc … f … R (f a1 a2) b1 b2.
 /3 width=3 by ltc_rc, ltc_trans/ qed.
 
-lemma ltc_dx (A) (f) (B) (R): ∀a1,b1,b. ltc A f B R a1 b1 b →
-                              ∀a2,b2. R a2 b b2 → ltc … f … R (f a1 a2) b1 b2.
+lemma ltc_dx (A) (f) (B) (R):
+      ∀a1,b1,b. ltc A f B R a1 b1 b →
+      ∀a2,b2. R a2 b b2 → ltc … f … R (f a1 a2) b1 b2.
 /3 width=3 by ltc_rc, ltc_trans/ qed.
 
 (* Basic eliminations *******************************************************)
 
-lemma ltc_ind_sn (A) (f) (B) (R) (Q:relation2 A B) (b2): associative … f →
-                 (∀a,b1. R a b1 b2 → Q a b1) →
-                 (∀a1,a2,b1,b. R a1 b1 b → ltc … f … R a2 b b2 → Q a2 b → Q (f a1 a2) b1) →
-                 ∀a,b1. ltc … f … R a b1 b2 → Q a b1.
+lemma ltc_ind_sn (A) (f) (B) (R) (Q:relation2 A B) (b2):
+      associative … f →
+      (∀a,b1. R a b1 b2 → Q a b1) →
+      (∀a1,a2,b1,b. R a1 b1 b → ltc … f … R a2 b b2 → Q a2 b → Q (f a1 a2) b1) →
+      ∀a,b1. ltc … f … R a b1 b2 → Q a b1.
 #A #f #B #R #Q #b2 #Hf #IH1 #IH2 #a #b1 @(insert_eq_1 … b2)
 #b0 #H elim H -a -b1 -b0 /2 width=2 by/
 #a1 #a2 #b1 #b #b0 #H #Hb2 #_
@@ -45,10 +48,11 @@ generalize in match Hb2; generalize in match a2; -Hb2 -a2
 elim H -a1 -b1 -b /4 width=4 by ltc_trans/
 qed-.
 
-lemma ltc_ind_dx (A) (f) (B) (R) (Q:A→predicate B) (b1): associative … f →
-                 (∀a,b2. R a b1 b2 → Q a b2) →
-                 (∀a1,a2,b,b2. ltc … f … R a1 b1 b → Q a1 b → R a2 b b2 → Q (f a1 a2) b2) →
-                 ∀a,b2. ltc … f … R a b1 b2 → Q a b2.
+lemma ltc_ind_dx (A) (f) (B) (R) (Q:A→predicate B) (b1):
+      associative … f →
+      (∀a,b2. R a b1 b2 → Q a b2) →
+      (∀a1,a2,b,b2. ltc … f … R a1 b1 b → Q a1 b → R a2 b b2 → Q (f a1 a2) b2) →
+      ∀a,b2. ltc … f … R a b1 b2 → Q a b2.
 #A #f #B #R #Q #b1 #Hf #IH1 #IH2 #a #b2 @(insert_eq_1 … b1)
 #b0 #H elim H -a -b0 -b2 /2 width=2 by/
 #a1 #a2 #b0 #b #b2 #Hb0 #H #IHb0 #_
@@ -59,20 +63,20 @@ qed-.
 (* Advanced eliminations (with reflexivity) *********************************)
 
 lemma ltc_ind_sn_refl (A) (i) (f) (B) (R) (Q:relation2 A B) (b2):
-                      associative … f → right_identity … f i → reflexive B (R i) →
-                      Q i b2 →
-                      (∀a1,a2,b1,b. R a1 b1 b → ltc … f … R a2 b b2 → Q a2 b → Q (f a1 a2) b1) →
-                      ∀a,b1. ltc … f … R a b1 b2 → Q a b1.
+      associative … f → right_identity … f i → reflexive B (R i) →
+      Q i b2 →
+      (∀a1,a2,b1,b. R a1 b1 b → ltc … f … R a2 b b2 → Q a2 b → Q (f a1 a2) b1) →
+      ∀a,b1. ltc … f … R a b1 b2 → Q a b1.
 #A #i #f #B #R #Q #b2 #H1f #H2f #HR #IH1 #IH2 #a #b1 #H
 @(ltc_ind_sn … R … H1f … IH2 … H) -a -b1 -H1f #a #b1 #Hb12
 >(H2f a) -H2f /3 width=4 by ltc_rc/
 qed-.
 
 lemma ltc_ind_dx_refl (A) (i) (f) (B) (R) (Q:A→predicate B) (b1):
-                      associative … f → left_identity … f i → reflexive B (R i) →
-                      Q i b1 →
-                      (∀a1,a2,b,b2. ltc … f … R a1 b1 b → Q a1 b → R a2 b b2 → Q (f a1 a2) b2) →
-                      ∀a,b2. ltc … f … R a b1 b2 → Q a b2.
+      associative … f → left_identity … f i → reflexive B (R i) →
+      Q i b1 →
+      (∀a1,a2,b,b2. ltc … f … R a1 b1 b → Q a1 b → R a2 b b2 → Q (f a1 a2) b2) →
+      ∀a,b2. ltc … f … R a b1 b2 → Q a b2.
 #A #i #f #B #R #Q #b1 #H1f #H2f #HR #IH1 #IH2 #a #b2 #H
 @(ltc_ind_dx … R … H1f … IH2 … H) -a -b2 -H1f #a #b2 #Hb12
 >(H2f a) -H2f /3 width=4 by ltc_rc/
@@ -80,10 +84,11 @@ qed-.
 
 (* Constructions with lsub **************************************************)
 
-lemma ltc_lsub_trans: ∀A,f. associative … f →
-                      ∀B,C,R,S. (∀n. lsub_trans B C (λL. R L n) S) →
-                      ∀n. lsub_trans B C (λL. ltc A f … (R L) n) S.
-#A #f #Hf #B #C #R #S #HRS #n #L2 #T1 #T2 #H
+lemma ltc_lsub_trans (A) (f) (B) (C) (R) (S):
+      associative … f →
+      (∀n. lsub_trans B C (λL. R L n) S) →
+      ∀n. lsub_trans B C (λL. ltc A f … (R L) n) S.
+#A #f #B #C #R #S #Hf #HRS #n #L2 #T1 #T2 #H
 @(ltc_ind_dx … Hf ???? H) -n -T2
 /3 width=5 by ltc_dx, ltc_rc/
 qed-.