--- a/src/ZF/OrderArith.thy Sun Jul 14 15:11:21 2002 +0200
+++ b/src/ZF/OrderArith.thy Sun Jul 14 15:14:43 2002 +0200
@@ -3,9 +3,10 @@
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1994 University of Cambridge
-Towards ordinal arithmetic. Also useful with wfrec.
*)
+header{*Combining Orderings: Foundations of Ordinal Arithmetic*}
+
theory OrderArith = Order + Sum + Ordinal:
constdefs
@@ -32,29 +33,25 @@
"measure(A,f) == {<x,y>: A*A. f(x) < f(y)}"
-(**** Addition of relations -- disjoint sum ****)
+subsection{*Addition of Relations -- Disjoint Sum*}
(** Rewrite rules. Can be used to obtain introduction rules **)
lemma radd_Inl_Inr_iff [iff]:
"<Inl(a), Inr(b)> : radd(A,r,B,s) <-> a:A & b:B"
-apply (unfold radd_def, blast)
-done
+by (unfold radd_def, blast)
lemma radd_Inl_iff [iff]:
"<Inl(a'), Inl(a)> : radd(A,r,B,s) <-> a':A & a:A & <a',a>:r"
-apply (unfold radd_def, blast)
-done
+by (unfold radd_def, blast)
lemma radd_Inr_iff [iff]:
"<Inr(b'), Inr(b)> : radd(A,r,B,s) <-> b':B & b:B & <b',b>:s"
-apply (unfold radd_def, blast)
-done
+by (unfold radd_def, blast)
lemma radd_Inr_Inl_iff [iff]:
"<Inr(b), Inl(a)> : radd(A,r,B,s) <-> False"
-apply (unfold radd_def, blast)
-done
+by (unfold radd_def, blast)
(** Elimination Rule **)
@@ -64,8 +61,7 @@
!!x' x. [| p'=Inl(x'); p=Inl(x); <x',x>: r; x':A; x:A |] ==> Q;
!!y' y. [| p'=Inr(y'); p=Inr(y); <y',y>: s; y':B; y:B |] ==> Q
|] ==> Q"
-apply (unfold radd_def, blast)
-done
+by (unfold radd_def, blast)
(** Type checking **)
@@ -80,8 +76,7 @@
lemma linear_radd:
"[| linear(A,r); linear(B,s) |] ==> linear(A+B,radd(A,r,B,s))"
-apply (unfold linear_def, blast)
-done
+by (unfold linear_def, blast)
(** Well-foundedness **)
@@ -119,7 +114,8 @@
lemma sum_bij:
"[| f: bij(A,C); g: bij(B,D) |]
==> (lam z:A+B. case(%x. Inl(f`x), %y. Inr(g`y), z)) : bij(A+B, C+D)"
-apply (rule_tac d = "case (%x. Inl (converse (f) `x), %y. Inr (converse (g) `y))" in lam_bijective)
+apply (rule_tac d = "case (%x. Inl (converse(f)`x), %y. Inr(converse(g)`y))"
+ in lam_bijective)
apply (typecheck add: bij_is_inj inj_is_fun)
apply (auto simp add: left_inverse_bij right_inverse_bij)
done
@@ -156,11 +152,10 @@
"(lam z:(A+B)+C. case(case(Inl, %y. Inr(Inl(y))), %y. Inr(Inr(y)), z))
: ord_iso((A+B)+C, radd(A+B, radd(A,r,B,s), C, t),
A+(B+C), radd(A, r, B+C, radd(B,s,C,t)))"
-apply (rule sum_assoc_bij [THEN ord_isoI], auto)
-done
+by (rule sum_assoc_bij [THEN ord_isoI], auto)
-(**** Multiplication of relations -- lexicographic product ****)
+subsection{*Multiplication of Relations -- Lexicographic Product*}
(** Rewrite rule. Can be used to obtain introduction rules **)
@@ -169,23 +164,19 @@
(<a',a>: r & a':A & a:A & b': B & b: B) |
(<b',b>: s & a'=a & a:A & b': B & b: B)"
-apply (unfold rmult_def, blast)
-done
+by (unfold rmult_def, blast)
lemma rmultE:
"[| <<a',b'>, <a,b>> : rmult(A,r,B,s);
[| <a',a>: r; a':A; a:A; b':B; b:B |] ==> Q;
[| <b',b>: s; a:A; a'=a; b':B; b:B |] ==> Q
|] ==> Q"
-apply blast
-done
+by blast
(** Type checking **)
lemma rmult_type: "rmult(A,r,B,s) <= (A*B) * (A*B)"
-apply (unfold rmult_def)
-apply (rule Collect_subset)
-done
+by (unfold rmult_def, rule Collect_subset)
lemmas field_rmult = rmult_type [THEN field_rel_subset]
@@ -193,8 +184,7 @@
lemma linear_rmult:
"[| linear(A,r); linear(B,s) |] ==> linear(A*B,rmult(A,r,B,s))"
-apply (simp add: linear_def, blast)
-done
+by (simp add: linear_def, blast)
(** Well-foundedness **)
@@ -289,33 +279,28 @@
lemma sum_prod_distrib_bij:
"(lam <x,z>:(A+B)*C. case(%y. Inl(<y,z>), %y. Inr(<y,z>), x))
: bij((A+B)*C, (A*C)+(B*C))"
-apply (rule_tac d = "case (%<x,y>.<Inl (x),y>, %<x,y>.<Inr (x),y>) "
- in lam_bijective)
-apply auto
-done
+by (rule_tac d = "case (%<x,y>.<Inl (x),y>, %<x,y>.<Inr (x),y>) "
+ in lam_bijective, auto)
lemma sum_prod_distrib_ord_iso:
"(lam <x,z>:(A+B)*C. case(%y. Inl(<y,z>), %y. Inr(<y,z>), x))
: ord_iso((A+B)*C, rmult(A+B, radd(A,r,B,s), C, t),
(A*C)+(B*C), radd(A*C, rmult(A,r,C,t), B*C, rmult(B,s,C,t)))"
-apply (rule sum_prod_distrib_bij [THEN ord_isoI], auto)
-done
+by (rule sum_prod_distrib_bij [THEN ord_isoI], auto)
(** Associativity **)
lemma prod_assoc_bij:
"(lam <<x,y>, z>:(A*B)*C. <x,<y,z>>) : bij((A*B)*C, A*(B*C))"
-apply (rule_tac d = "%<x, <y,z>>. <<x,y>, z>" in lam_bijective, auto)
-done
+by (rule_tac d = "%<x, <y,z>>. <<x,y>, z>" in lam_bijective, auto)
lemma prod_assoc_ord_iso:
"(lam <<x,y>, z>:(A*B)*C. <x,<y,z>>)
: ord_iso((A*B)*C, rmult(A*B, rmult(A,r,B,s), C, t),
A*(B*C), rmult(A, r, B*C, rmult(B,s,C,t)))"
-apply (rule prod_assoc_bij [THEN ord_isoI], auto)
-done
+by (rule prod_assoc_bij [THEN ord_isoI], auto)
-(**** Inverse image of a relation ****)
+subsection{*Inverse Image of a Relation*}
(** Rewrite rule **)
@@ -325,8 +310,7 @@
(** Type checking **)
lemma rvimage_type: "rvimage(A,f,r) <= A*A"
-apply (unfold rvimage_def)
-apply (rule Collect_subset)
+apply (unfold rvimage_def, rule Collect_subset)
done
lemmas field_rvimage = rvimage_type [THEN field_rel_subset]
@@ -410,8 +394,7 @@
lemma ord_iso_rvimage_eq:
"f: ord_iso(A,r, B,s) ==> rvimage(A,f,s) = r Int A*A"
-apply (unfold ord_iso_def rvimage_def, blast)
-done
+by (unfold ord_iso_def rvimage_def, blast)
(** The "measure" relation is useful with wfrec **)
@@ -424,12 +407,10 @@
done
lemma wf_measure [iff]: "wf(measure(A,f))"
-apply (simp (no_asm) add: measure_eq_rvimage_Memrel wf_Memrel wf_rvimage)
-done
+by (simp (no_asm) add: measure_eq_rvimage_Memrel wf_Memrel wf_rvimage)
lemma measure_iff [iff]: "<x,y> : measure(A,f) <-> x:A & y:A & f(x)<f(y)"
-apply (simp (no_asm) add: measure_def)
-done
+by (simp (no_asm) add: measure_def)
ML {*
val measure_def = thm "measure_def";