
diff -r 78d828f43cdf -r 4b4742aa43f2 Tutorial/Lambda.thy
--- a/Tutorial/Lambda.thy	Sat Dec 17 16:58:11 2011 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,173 +0,0 @@
-theory Lambda
-imports "../Nominal/Nominal2" 
-begin
-
-section {* Definitions for Lambda Terms *}
-
-
-text {* type of variables *}
-
-atom_decl name
-
-
-subsection {* Alpha-Equated Lambda Terms *}
-
-nominal_datatype lam =
-  Var "name"
-| App "lam" "lam"
-| Lam x::"name" l::"lam" bind x in l ("Lam [_]. _" [100, 100] 100)
-
-
-text {* some automatically derived theorems *}
-
-thm lam.distinct
-thm lam.eq_iff
-thm lam.fresh
-thm lam.size
-thm lam.exhaust 
-thm lam.strong_exhaust
-thm lam.induct
-thm lam.strong_induct
-
-
-subsection {* Height Function *}
-
-nominal_primrec
-  height :: "lam \<Rightarrow> int"
-where
-  "height (Var x) = 1"
-| "height (App t1 t2) = max (height t1) (height t2) + 1"
-| "height (Lam [x].t) = height t + 1"
-apply(subgoal_tac "\<And>p x r. height_graph x r \<Longrightarrow> height_graph (p \<bullet> x) (p \<bullet> r)") 
-unfolding eqvt_def
-apply(rule allI)
-apply(simp add: permute_fun_def)
-apply(rule ext)
-apply(rule ext)
-apply(simp add: permute_bool_def)
-apply(rule iffI)
-apply(drule_tac x="p" in meta_spec)
-apply(drule_tac x="- p \<bullet> x" in meta_spec)
-apply(drule_tac x="- p \<bullet> xa" in meta_spec)
-apply(simp)
-apply(drule_tac x="-p" in meta_spec)
-apply(drule_tac x="x" in meta_spec)
-apply(drule_tac x="xa" in meta_spec)
-apply(simp)
-apply(erule height_graph.induct)
-apply(perm_simp)
-apply(rule height_graph.intros)
-apply(perm_simp)
-apply(rule height_graph.intros)
-apply(assumption)
-apply(assumption)
-apply(perm_simp)
-apply(rule height_graph.intros)
-apply(assumption)
-apply(rule_tac y="x" in lam.exhaust)
-apply(auto simp add: lam.distinct lam.eq_iff)
-apply(simp add: Abs_eq_iff alphas)
-apply(clarify)
-apply(subst (4) supp_perm_eq[where p="p", symmetric])
-apply(simp add: pure_supp  fresh_star_def)
-apply(simp add: eqvt_at_def)
-done
-
-termination
-  by (relation "measure size") (simp_all add: lam.size)
-  
-
-subsection {* Capture-Avoiding Substitution *}
-
-nominal_primrec
-  subst :: "lam \<Rightarrow> name \<Rightarrow> lam \<Rightarrow> lam"  ("_ [_ ::= _]" [90,90,90] 90)
-where
-  "(Var x)[y ::= s] = (if x = y then s else (Var x))"
-| "(App t1 t2)[y ::= s] = App (t1[y ::= s]) (t2[y ::= s])"
-| "atom x \<sharp> (y, s) \<Longrightarrow> (Lam [x]. t)[y ::= s] = Lam [x].(t[y ::= s])"
-apply(subgoal_tac "\<And>p x r. subst_graph x r \<Longrightarrow> subst_graph (p \<bullet> x) (p \<bullet> r)") 
-unfolding eqvt_def
-apply(rule allI)
-apply(simp add: permute_fun_def)
-apply(rule ext)
-apply(rule ext)
-apply(simp add: permute_bool_def)
-apply(rule iffI)
-apply(drule_tac x="p" in meta_spec)
-apply(drule_tac x="- p \<bullet> x" in meta_spec)
-apply(drule_tac x="- p \<bullet> xa" in meta_spec)
-apply(simp)
-apply(drule_tac x="-p" in meta_spec)
-apply(drule_tac x="x" in meta_spec)
-apply(drule_tac x="xa" in meta_spec)
-apply(simp)
-apply(erule subst_graph.induct)
-apply(perm_simp)
-apply(rule subst_graph.intros)
-apply(perm_simp)
-apply(rule subst_graph.intros)
-apply(assumption)
-apply(assumption)
-apply(perm_simp)
-apply(rule subst_graph.intros)
-apply(simp add: fresh_Pair)
-apply(assumption)
-apply(auto simp add: lam.distinct lam.eq_iff)
-apply(rule_tac y="a" and c="(aa, b)" in lam.strong_exhaust)
-apply(blast)+
-apply(simp add: fresh_star_def)
-apply(subgoal_tac "atom xa \<sharp> [[atom x]]lst. t \<and> atom x \<sharp> [[atom xa]]lst. ta")
-apply(subst (asm) Abs_eq_iff2)
-apply(simp add: alphas atom_eqvt)
-apply(clarify)
-apply(rule trans)
-apply(rule_tac p="p" in supp_perm_eq[symmetric])
-apply(rule fresh_star_supp_conv)
-apply(drule fresh_star_perm_set_conv)
-apply(simp add: finite_supp)
-apply(subgoal_tac "{atom (p \<bullet> x), atom x} \<sharp>* ([[atom x]]lst. subst_sumC (t, ya, sa))")
-apply(auto simp add: fresh_star_def)[1]
-apply(simp (no_asm) add: fresh_star_def)
-apply(rule conjI)
-apply(simp (no_asm) add: Abs_fresh_iff)
-apply(clarify)
-apply(drule_tac a="atom (p \<bullet> x)" in fresh_eqvt_at)
-apply(simp add: finite_supp)
-apply(simp (no_asm_use) add: fresh_Pair)
-apply(simp add: Abs_fresh_iff)
-apply(simp)
-apply(simp add: Abs_fresh_iff)
-apply(subgoal_tac "p \<bullet> ya = ya")
-apply(subgoal_tac "p \<bullet> sa = sa")
-apply(simp add: atom_eqvt eqvt_at_def)
-apply(rule perm_supp_eq)
-apply(auto simp add: fresh_star_def fresh_Pair)[1]
-apply(rule perm_supp_eq)
-apply(auto simp add: fresh_star_def fresh_Pair)[1]
-apply(rule conjI)
-apply(simp add: Abs_fresh_iff)
-apply(drule sym)
-apply(simp add: Abs_fresh_iff)
-done
-
-termination
-  by (relation "measure (\<lambda>(t, _, _). size t)")
-     (simp_all add: lam.size)
-
-lemma subst_eqvt[eqvt]:
-  shows "(p \<bullet> t[x ::= s]) = (p \<bullet> t)[(p \<bullet> x) ::= (p \<bullet> s)]"
-by (induct t x s rule: subst.induct) (simp_all)
-
-lemma fresh_fact:
-  assumes a: "atom z \<sharp> s"
-  and b: "z = y \<or> atom z \<sharp> t"
-  shows "atom z \<sharp> t[y ::= s]"
-using a b
-by (nominal_induct t avoiding: z y s rule: lam.strong_induct)
-   (auto simp add: lam.fresh fresh_at_base)
-
-
-end
-
-
-




