--- a/src/HOL/Library/Order_Relation.thy Thu Dec 05 17:52:12 2013 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,116 +0,0 @@
-(* Author: Tobias Nipkow *)
-
-header {* Orders as Relations *}
-
-theory Order_Relation
-imports Main
-begin
-
-subsection{* Orders on a set *}
-
-definition "preorder_on A r \<equiv> refl_on A r \<and> trans r"
-
-definition "partial_order_on A r \<equiv> preorder_on A r \<and> antisym r"
-
-definition "linear_order_on A r \<equiv> partial_order_on A r \<and> total_on A r"
-
-definition "strict_linear_order_on A r \<equiv> trans r \<and> irrefl r \<and> total_on A r"
-
-definition "well_order_on A r \<equiv> linear_order_on A r \<and> wf(r - Id)"
-
-lemmas order_on_defs =
- preorder_on_def partial_order_on_def linear_order_on_def
- strict_linear_order_on_def well_order_on_def
-
-
-lemma preorder_on_empty[simp]: "preorder_on {} {}"
-by(simp add:preorder_on_def trans_def)
-
-lemma partial_order_on_empty[simp]: "partial_order_on {} {}"
-by(simp add:partial_order_on_def)
-
-lemma lnear_order_on_empty[simp]: "linear_order_on {} {}"
-by(simp add:linear_order_on_def)
-
-lemma well_order_on_empty[simp]: "well_order_on {} {}"
-by(simp add:well_order_on_def)
-
-
-lemma preorder_on_converse[simp]: "preorder_on A (r^-1) = preorder_on A r"
-by (simp add:preorder_on_def)
-
-lemma partial_order_on_converse[simp]:
- "partial_order_on A (r^-1) = partial_order_on A r"
-by (simp add: partial_order_on_def)
-
-lemma linear_order_on_converse[simp]:
- "linear_order_on A (r^-1) = linear_order_on A r"
-by (simp add: linear_order_on_def)
-
-
-lemma strict_linear_order_on_diff_Id:
- "linear_order_on A r \<Longrightarrow> strict_linear_order_on A (r-Id)"
-by(simp add: order_on_defs trans_diff_Id)
-
-
-subsection{* Orders on the field *}
-
-abbreviation "Refl r \<equiv> refl_on (Field r) r"
-
-abbreviation "Preorder r \<equiv> preorder_on (Field r) r"
-
-abbreviation "Partial_order r \<equiv> partial_order_on (Field r) r"
-
-abbreviation "Total r \<equiv> total_on (Field r) r"
-
-abbreviation "Linear_order r \<equiv> linear_order_on (Field r) r"
-
-abbreviation "Well_order r \<equiv> well_order_on (Field r) r"
-
-
-lemma subset_Image_Image_iff:
- "\<lbrakk> Preorder r; A \<subseteq> Field r; B \<subseteq> Field r\<rbrakk> \<Longrightarrow>
- r `` A \<subseteq> r `` B \<longleftrightarrow> (\<forall>a\<in>A.\<exists>b\<in>B. (b,a):r)"
-unfolding preorder_on_def refl_on_def Image_def
-apply (simp add: subset_eq)
-unfolding trans_def by fast
-
-lemma subset_Image1_Image1_iff:
- "\<lbrakk> Preorder r; a : Field r; b : Field r\<rbrakk> \<Longrightarrow> r `` {a} \<subseteq> r `` {b} \<longleftrightarrow> (b,a):r"
-by(simp add:subset_Image_Image_iff)
-
-lemma Refl_antisym_eq_Image1_Image1_iff:
- "\<lbrakk>Refl r; antisym r; a:Field r; b:Field r\<rbrakk> \<Longrightarrow> r `` {a} = r `` {b} \<longleftrightarrow> a=b"
-by(simp add: set_eq_iff antisym_def refl_on_def) metis
-
-lemma Partial_order_eq_Image1_Image1_iff:
- "\<lbrakk>Partial_order r; a:Field r; b:Field r\<rbrakk> \<Longrightarrow> r `` {a} = r `` {b} \<longleftrightarrow> a=b"
-by(auto simp:order_on_defs Refl_antisym_eq_Image1_Image1_iff)
-
-lemma Total_Id_Field:
-assumes TOT: "Total r" and NID: "\<not> (r <= Id)"
-shows "Field r = Field(r - Id)"
-using mono_Field[of "r - Id" r] Diff_subset[of r Id]
-proof(auto)
- have "r \<noteq> {}" using NID by fast
- then obtain b and c where "b \<noteq> c \<and> (b,c) \<in> r" using NID by fast
- hence 1: "b \<noteq> c \<and> {b,c} \<le> Field r" by (auto simp: Field_def)
- (* *)
- fix a assume *: "a \<in> Field r"
- obtain d where 2: "d \<in> Field r" and 3: "d \<noteq> a"
- using * 1 by auto
- hence "(a,d) \<in> r \<or> (d,a) \<in> r" using * TOT
- by (simp add: total_on_def)
- thus "a \<in> Field(r - Id)" using 3 unfolding Field_def by blast
-qed
-
-
-subsection{* Orders on a type *}
-
-abbreviation "strict_linear_order \<equiv> strict_linear_order_on UNIV"
-
-abbreviation "linear_order \<equiv> linear_order_on UNIV"
-
-abbreviation "well_order r \<equiv> well_order_on UNIV"
-
-end