Nominal/Term7.thy
author Christian Urban <urbanc@in.tum.de>
Tue, 16 Mar 2010 18:13:34 +0100
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theory Term7
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imports "Nominal2_Atoms" "Nominal2_Eqvt" "Nominal2_Supp" "Abs" "Perm" "Fv" "Rsp" "../Attic/Prove"
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begin
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atom_decl name
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(* example with a respectful bn function defined over the type itself *)
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datatype rtrm7 =
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  rVr7 "name"
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| rLm7 "name" "rtrm7" --"bind left in right"
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| rLt7 "rtrm7" "rtrm7" --"bind (bv7 left) in (right)"
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primrec
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  rbv7
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where
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  "rbv7 (rVr7 n) = {atom n}"
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| "rbv7 (rLm7 n t) = rbv7 t - {atom n}"
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| "rbv7 (rLt7 l r) = rbv7 l \<union> rbv7 r"
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setup {* snd o define_raw_perms (Datatype.the_info @{theory} "Term7.rtrm7") 1 *}
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thm permute_rtrm7.simps
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local_setup {* snd o define_fv_alpha (Datatype.the_info @{theory} "Term7.rtrm7") [
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  [[[]], [[(NONE, 0)], [(NONE, 0)]], [[], [(SOME @{term rbv7}, 0)]]]] *}
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print_theorems
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notation
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  alpha_rtrm7 ("_ \<approx>7a _" [100, 100] 100)
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thm alpha_rtrm7.intros
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thm fv_rtrm7.simps
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inductive
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  alpha7 :: "rtrm7 \<Rightarrow> rtrm7 \<Rightarrow> bool" ("_ \<approx>7 _" [100, 100] 100)
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where
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  a1: "a = b \<Longrightarrow> (rVr7 a) \<approx>7 (rVr7 b)"
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| a2: "(\<exists>pi. (({atom a}, t) \<approx>gen alpha7 fv_rtrm7 pi ({atom b}, s))) \<Longrightarrow> rLm7 a t \<approx>7 rLm7 b s"
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| a3: "(\<exists>pi. (((rbv7 t1), s1) \<approx>gen alpha7 fv_rtrm7 pi ((rbv7 t2), s2))) \<Longrightarrow> rLt7 t1 s1 \<approx>7 rLt7 t2 s2"
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lemma "(x::name) \<noteq> y \<Longrightarrow> \<not> (alpha7 ===> op =) rbv7 rbv7"
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  apply simp
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  apply (rule_tac x="rLt7 (rVr7 x) (rVr7 x)" in exI)
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  apply (rule_tac x="rLt7 (rVr7 y) (rVr7 y)" in exI)
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  apply simp
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  apply (rule a3)
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  apply (rule_tac x="(x \<leftrightarrow> y)" in exI)
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  apply (simp_all add: alpha_gen fresh_star_def)
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  apply (rule a1)
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  apply (rule refl)
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done
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end