--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Attic/Quot/Examples/Terms.thy Thu Feb 25 07:57:17 2010 +0100
@@ -0,0 +1,271 @@
+theory Terms
+imports Nominal "../Quotient" "../Quotient_List"
+begin
+
+atom_decl name
+
+text {* primrec seems to be genarally faster than fun *}
+
+section {*** lets with binding patterns ***}
+
+datatype trm1 =
+ Vr1 "name"
+| Ap1 "trm1" "trm1"
+| Lm1 "name" "trm1" --"name is bound in trm1"
+| Lt1 "bp" "trm1" "trm1" --"all variables in bp are bound in the 2nd trm1"
+and bp =
+ BUnit
+| BVr "name"
+| BPr "bp" "bp"
+
+(* to be given by the user *)
+primrec
+ bv1
+where
+ "bv1 (BUnit) = {}"
+| "bv1 (BVr x) = {x}"
+| "bv1 (BPr bp1 bp2) = (bv1 bp1) \<union> (bv1 bp1)"
+
+(* needs to be calculated by the package *)
+primrec
+ fv_trm1 and fv_bp
+where
+ "fv_trm1 (Vr1 x) = {x}"
+| "fv_trm1 (Ap1 t1 t2) = (fv_trm1 t1) \<union> (fv_trm1 t2)"
+| "fv_trm1 (Lm1 x t) = (fv_trm1 t) - {x}"
+| "fv_trm1 (Lt1 bp t1 t2) = (fv_trm1 t1) \<union> (fv_trm1 t2 - bv1 bp)"
+| "fv_bp (BUnit) = {}"
+| "fv_bp (BVr x) = {x}"
+| "fv_bp (BPr b1 b2) = (fv_bp b1) \<union> (fv_bp b2)"
+
+(* needs to be stated by the package *)
+overloading
+ perm_trm1 \<equiv> "perm :: 'x prm \<Rightarrow> trm1 \<Rightarrow> trm1" (unchecked)
+ perm_bp \<equiv> "perm :: 'x prm \<Rightarrow> bp \<Rightarrow> bp" (unchecked)
+begin
+
+primrec
+ perm_trm1 and perm_bp
+where
+ "perm_trm1 pi (Vr1 a) = Vr1 (pi \<bullet> a)"
+| "perm_trm1 pi (Ap1 t1 t2) = Ap1 (perm_trm1 pi t1) (perm_trm1 pi t2)"
+| "perm_trm1 pi (Lm1 a t) = Lm1 (pi \<bullet> a) (perm_trm1 pi t)"
+| "perm_trm1 pi (Lt1 bp t1 t2) = Lt1 (perm_bp pi bp) (perm_trm1 pi t1) (perm_trm1 pi t2)"
+| "perm_bp pi (BUnit) = BUnit"
+| "perm_bp pi (BVr a) = BVr (pi \<bullet> a)"
+| "perm_bp pi (BPr bp1 bp2) = BPr (perm_bp pi bp1) (perm_bp pi bp2)"
+
+end
+
+inductive
+ alpha1 :: "trm1 \<Rightarrow> trm1 \<Rightarrow> bool" ("_ \<approx>1 _" [100, 100] 100)
+where
+ a1: "a = b \<Longrightarrow> (Vr1 a) \<approx>1 (Vr1 b)"
+| a2: "\<lbrakk>t1 \<approx>1 t2; s1 \<approx>1 s2\<rbrakk> \<Longrightarrow> Ap1 t1 s1 \<approx>1 Ap1 t2 s2"
+| a3: "\<exists>pi::name prm. (fv_trm1 t - {a} = fv_trm1 s - {b} \<and>
+ (fv_trm1 t - {a})\<sharp>* pi \<and>
+ (pi \<bullet> t) \<approx>1 s \<and> (pi \<bullet> a) = b)
+ \<Longrightarrow> Lm1 a t \<approx>1 Lm1 b s"
+| a4: "\<exists>pi::name prm.(
+ t1 \<approx>1 t2 \<and>
+ (fv_trm1 s1 - fv_bp b1 = fv_trm1 s2 - fv_bp b2) \<and>
+ (fv_trm1 s1 - fv_bp b1) \<sharp>* pi \<and>
+ (pi \<bullet> s1 = s2) (* Optional: \<and> (pi \<bullet> b1 = b2) *)
+ ) \<Longrightarrow> Lt1 b1 t1 s1 \<approx>1 Lt1 b2 t2 s2"
+
+lemma alpha1_equivp: "equivp alpha1" sorry
+
+quotient_type qtrm1 = trm1 / alpha1
+ by (rule alpha1_equivp)
+
+
+section {*** lets with single assignments ***}
+
+datatype trm2 =
+ Vr2 "name"
+| Ap2 "trm2" "trm2"
+| Lm2 "name" "trm2"
+| Lt2 "assign" "trm2"
+and assign =
+ As "name" "trm2"
+
+(* to be given by the user *)
+primrec
+ bv2
+where
+ "bv2 (As x t) = {x}"
+
+(* needs to be calculated by the package *)
+primrec
+ fv_trm2 and fv_assign
+where
+ "fv_trm2 (Vr2 x) = {x}"
+| "fv_trm2 (Ap2 t1 t2) = (fv_trm2 t1) \<union> (fv_trm2 t2)"
+| "fv_trm2 (Lm2 x t) = (fv_trm2 t) - {x}"
+| "fv_trm2 (Lt2 as t) = (fv_trm2 t - bv2 as) \<union> (fv_assign as)"
+| "fv_assign (As x t) = (fv_trm2 t)"
+
+(* needs to be stated by the package *)
+overloading
+ perm_trm2 \<equiv> "perm :: 'x prm \<Rightarrow> trm2 \<Rightarrow> trm2" (unchecked)
+ perm_assign \<equiv> "perm :: 'x prm \<Rightarrow> assign \<Rightarrow> assign" (unchecked)
+begin
+
+primrec
+ perm_trm2 and perm_assign
+where
+ "perm_trm2 pi (Vr2 a) = Vr2 (pi \<bullet> a)"
+| "perm_trm2 pi (Ap2 t1 t2) = Ap2 (perm_trm2 pi t1) (perm_trm2 pi t2)"
+| "perm_trm2 pi (Lm2 a t) = Lm2 (pi \<bullet> a) (perm_trm2 pi t)"
+| "perm_trm2 pi (Lt2 as t) = Lt2 (perm_assign pi as) (perm_trm2 pi t)"
+| "perm_assign pi (As a t) = As (pi \<bullet> a) (perm_trm2 pi t)"
+
+end
+
+inductive
+ alpha2 :: "trm2 \<Rightarrow> trm2 \<Rightarrow> bool" ("_ \<approx>2 _" [100, 100] 100)
+where
+ a1: "a = b \<Longrightarrow> (Vr2 a) \<approx>2 (Vr2 b)"
+| a2: "\<lbrakk>t1 \<approx>2 t2; s1 \<approx>2 s2\<rbrakk> \<Longrightarrow> Ap2 t1 s1 \<approx>2 Ap2 t2 s2"
+| a3: "\<exists>pi::name prm. (fv_trm2 t - {a} = fv_trm2 s - {b} \<and>
+ (fv_trm2 t - {a})\<sharp>* pi \<and>
+ (pi \<bullet> t) \<approx>2 s \<and>
+ (pi \<bullet> a) = b)
+ \<Longrightarrow> Lm2 a t \<approx>2 Lm2 b s"
+| a4: "\<exists>pi::name prm. (
+ fv_trm2 t1 - fv_assign b1 = fv_trm2 t2 - fv_assign b2 \<and>
+ (fv_trm2 t1 - fv_assign b1) \<sharp>* pi \<and>
+ pi \<bullet> t1 = t2 (* \<and> (pi \<bullet> b1 = b2) *)
+ ) \<Longrightarrow> Lt2 b1 t1 \<approx>2 Lt2 b2 t2"
+
+lemma alpha2_equivp: "equivp alpha2" sorry
+
+quotient_type qtrm2 = trm2 / alpha2
+ by (rule alpha2_equivp)
+
+section {*** lets with many assignments ***}
+
+datatype trm3 =
+ Vr3 "name"
+| Ap3 "trm3" "trm3"
+| Lm3 "name" "trm3"
+| Lt3 "assigns" "trm3"
+and assigns =
+ ANil
+| ACons "name" "trm3" "assigns"
+
+(* to be given by the user *)
+primrec
+ bv3
+where
+ "bv3 ANil = {}"
+| "bv3 (ACons x t as) = {x} \<union> (bv3 as)"
+
+primrec
+ fv_trm3 and fv_assigns
+where
+ "fv_trm3 (Vr3 x) = {x}"
+| "fv_trm3 (Ap3 t1 t2) = (fv_trm3 t1) \<union> (fv_trm3 t2)"
+| "fv_trm3 (Lm3 x t) = (fv_trm3 t) - {x}"
+| "fv_trm3 (Lt3 as t) = (fv_trm3 t - bv3 as) \<union> (fv_assigns as)"
+| "fv_assigns (ANil) = {}"
+| "fv_assigns (ACons x t as) = (fv_trm3 t) \<union> (fv_assigns as)"
+
+(* needs to be stated by the package *)
+overloading
+ perm_trm3 \<equiv> "perm :: 'x prm \<Rightarrow> trm3 \<Rightarrow> trm3" (unchecked)
+ perm_assigns \<equiv> "perm :: 'x prm \<Rightarrow> assigns \<Rightarrow> assigns" (unchecked)
+begin
+
+primrec
+ perm_trm3 and perm_assigns
+where
+ "perm_trm3 pi (Vr3 a) = Vr3 (pi \<bullet> a)"
+| "perm_trm3 pi (Ap3 t1 t2) = Ap3 (perm_trm3 pi t1) (perm_trm3 pi t2)"
+| "perm_trm3 pi (Lm3 a t) = Lm3 (pi \<bullet> a) (perm_trm3 pi t)"
+| "perm_trm3 pi (Lt3 as t) = Lt3 (perm_assigns pi as) (perm_trm3 pi t)"
+| "perm_assigns pi (ANil) = ANil"
+| "perm_assigns pi (ACons a t as) = ACons (pi \<bullet> a) (perm_trm3 pi t) (perm_assigns pi as)"
+
+end
+
+inductive
+ alpha3 :: "trm3 \<Rightarrow> trm3 \<Rightarrow> bool" ("_ \<approx>3 _" [100, 100] 100)
+where
+ a1: "a = b \<Longrightarrow> (Vr3 a) \<approx>3 (Vr3 b)"
+| a2: "\<lbrakk>t1 \<approx>3 t2; s1 \<approx>3 s2\<rbrakk> \<Longrightarrow> Ap3 t1 s1 \<approx>3 Ap3 t2 s2"
+| a3: "\<exists>pi::name prm. (fv_trm3 t - {a} = fv_trm3 s - {b} \<and>
+ (fv_trm3 t - {a})\<sharp>* pi \<and>
+ (pi \<bullet> t) \<approx>3 s \<and>
+ (pi \<bullet> a) = b)
+ \<Longrightarrow> Lm3 a t \<approx>3 Lm3 b s"
+| a4: "\<exists>pi::name prm. (
+ fv_trm3 t1 - fv_assigns b1 = fv_trm3 t2 - fv_assigns b2 \<and>
+ (fv_trm3 t1 - fv_assigns b1) \<sharp>* pi \<and>
+ pi \<bullet> t1 = t2 (* \<and> (pi \<bullet> b1 = b2) *)
+ ) \<Longrightarrow> Lt3 b1 t1 \<approx>3 Lt3 b2 t2"
+
+lemma alpha3_equivp: "equivp alpha3" sorry
+
+quotient_type qtrm3 = trm3 / alpha3
+ by (rule alpha3_equivp)
+
+
+section {*** lam with indirect list recursion ***}
+
+datatype trm4 =
+ Vr4 "name"
+| Ap4 "trm4" "trm4 list"
+| Lm4 "name" "trm4"
+
+thm trm4.recs
+
+primrec
+ fv_trm4 and fv_trm4_list
+where
+ "fv_trm4 (Vr4 x) = {x}"
+| "fv_trm4 (Ap4 t ts) = (fv_trm4 t) \<union> (fv_trm4_list ts)"
+| "fv_trm4 (Lm4 x t) = (fv_trm4 t) - {x}"
+| "fv_trm4_list ([]) = {}"
+| "fv_trm4_list (t#ts) = (fv_trm4 t) \<union> (fv_trm4_list ts)"
+
+
+(* needs to be stated by the package *)
+(* there cannot be a clause for lists, as *)
+(* permutations are already defined in Nominal (also functions, options, and so on) *)
+overloading
+ perm_trm4 \<equiv> "perm :: 'x prm \<Rightarrow> trm4 \<Rightarrow> trm4" (unchecked)
+begin
+
+primrec
+ perm_trm4
+where
+ "perm_trm4 pi (Vr4 a) = Vr4 (pi \<bullet> a)"
+| "perm_trm4 pi (Ap4 t ts) = Ap4 (perm_trm4 pi t) (pi \<bullet> ts)"
+| "perm_trm4 pi (Lm4 a t) = Lm4 (pi \<bullet> a) (perm_trm4 pi t)"
+
+end
+
+inductive
+ alpha4 :: "trm4 \<Rightarrow> trm4 \<Rightarrow> bool" ("_ \<approx>4 _" [100, 100] 100)
+and alpha4list :: "trm4 list \<Rightarrow> trm4 list \<Rightarrow> bool" ("_ \<approx>4list _" [100, 100] 100)
+where
+ a1: "a = b \<Longrightarrow> (Vr4 a) \<approx>4 (Vr4 b)"
+| a2: "\<lbrakk>t1 \<approx>4 t2; s1 \<approx>4list s2\<rbrakk> \<Longrightarrow> Ap4 t1 s1 \<approx>4 Ap4 t2 s2"
+| a4: "\<exists>pi::name prm. (fv_trm4 t - {a} = fv_trm4 s - {b} \<and>
+ (fv_trm4 t - {a})\<sharp>* pi \<and>
+ (pi \<bullet> t) \<approx>4 s \<and>
+ (pi \<bullet> a) = b)
+ \<Longrightarrow> Lm4 a t \<approx>4 Lm4 b s"
+| a5: "[] \<approx>4list []"
+| a6: "\<lbrakk>t \<approx>4 s; ts \<approx>4list ss\<rbrakk> \<Longrightarrow> (t#ts) \<approx>4list (s#ss)"
+
+lemma alpha4_equivp: "equivp alpha4" sorry
+lemma alpha4list_equivp: "equivp alpha4list" sorry
+
+quotient_type
+ qtrm4 = trm4 / alpha4 and
+ qtrm4list = "trm4 list" / alpha4list
+ by (simp_all add: alpha4_equivp alpha4list_equivp)
+
+end