theory Term4

begin

atom_decl name

section {*** lam with indirect list recursion ***}

datatype rtrm4 =

  rVr4 "name"

| rAp4 "rtrm4" "rtrm4 list"

| rLm4 "name" "rtrm4"  --"bind (name) in (trm)"

(* there cannot be a clause for lists, as *)

(* permutations are  already defined in Nominal (also functions, options, and so on) *)

ML {*

  val dtinfo = Datatype.the_info @{theory} "Term4.rtrm4";

  val {descr, sorts, ...} = dtinfo;

*}

setup {* snd o (define_raw_perms descr sorts @{thm rtrm4.induct} 1) *}

print_theorems

(* "repairing" of the permute function *)

lemma repaired:

  fixes ts::"rtrm4 list"

  shows "permute_rtrm4_list p ts = p \<bullet> ts"

  apply(induct ts)

  apply(simp_all)

  done

thm permute_rtrm4_permute_rtrm4_list.simps

lemmas perm_fixed = permute_rtrm4_permute_rtrm4_list.simps[simplified repaired]

lemma fix2: "alpha_rtrm4_list = list_rel alpha_rtrm4"

apply (rule ext)+

apply (induct_tac x xa rule: list_induct2')

apply (simp_all add: alpha_rtrm4_alpha_rtrm4_list.intros)

apply clarify apply (erule alpha_rtrm4_list.cases) apply(simp_all)

apply clarify apply (erule alpha_rtrm4_list.cases) apply(simp_all)

apply rule

apply (erule alpha_rtrm4_list.cases)

apply simp_all

apply (rule alpha_rtrm4_alpha_rtrm4_list.intros)

apply simp_all

done

lemma fix3: "fv_rtrm4_list = Union o (set o (map fv_rtrm4))"

apply (rule ext)

apply (induct_tac x)

apply simp_all

done

notation

  alpha_rtrm4 ("_ \<approx>4 _" [100, 100] 100) and

  alpha_rtrm4_list ("_ \<approx>4l _" [100, 100] 100)

thm alpha_rtrm4_alpha_rtrm4_list.intros[simplified fix2]

local_setup {* (fn ctxt => snd (Local_Theory.note ((@{binding alpha4_inj}, []), (build_rel_inj @{thms alpha_rtrm4_alpha_rtrm4_list.intros} @{thms rtrm4.distinct rtrm4.inject list.distinct list.inject} @{thms alpha_rtrm4.cases alpha_rtrm4_list.cases} ctxt)) ctxt)) *}

thm alpha4_inj

lemmas alpha4_inj_fixed = alpha4_inj[simplified fix2 fix3]

thm eqvts(1-2)

local_setup {*

(fn ctxt => snd (Local_Theory.note ((@{binding alpha4_eqvt}, []),

  build_alpha_eqvts [@{term alpha_rtrm4}, @{term alpha_rtrm4_list}] (fn _ => alpha_eqvt_tac @{thm alpha_rtrm4_alpha_rtrm4_list.induct} @{thms permute_rtrm4_permute_rtrm4_list.simps[simplified repaired] alpha4_inj} ctxt 1) ctxt) ctxt))

*}

thm alpha4_eqvt

lemmas alpha4_eqvt_fixed = alpha4_eqvt[simplified fix2 fix3]

local_setup {* (fn ctxt => snd (Local_Theory.note ((@{binding alpha4_reflp}, []),

  build_alpha_refl [((0, @{term alpha_rtrm4}), 0), ((0, @{term alpha_rtrm4_list}), 0)] [@{term alpha_rtrm4}, @{term alpha_rtrm4_list}] @{thm rtrm4.induct} @{thms alpha4_inj} ctxt) ctxt)) *}

thm alpha4_reflp

lemmas alpha4_reflp_fixed = alpha4_reflp[simplified fix2 fix3]

local_setup {* (fn ctxt => snd (Local_Theory.note ((@{binding alpha4_equivp}, []),

  (build_equivps [@{term alpha_rtrm4}, @{term alpha_rtrm4_list}] @{thms alpha4_reflp} @{thm alpha_rtrm4_alpha_rtrm4_list.induct} @{thms rtrm4.inject list.inject} @{thms alpha4_inj} @{thms rtrm4.distinct list.distinct} @{thms alpha_rtrm4_list.cases alpha_rtrm4.cases} @{thms alpha4_eqvt} ctxt)) ctxt)) *}

lemmas alpha4_equivp_fixed = alpha4_equivp[simplified fix2 fix3]

quotient_type 

  trm4 = rtrm4 / alpha_rtrm4

  by (simp_all add: alpha4_equivp)

local_setup {*

(fn ctxt => ctxt

 |> snd o (Quotient_Def.quotient_lift_const [] ("Vr4", @{term rVr4}))

 |> snd o (Quotient_Def.quotient_lift_const [@{typ "trm4"}] ("Ap4", @{term rAp4}))

 |> snd o (Quotient_Def.quotient_lift_const [] ("Lm4", @{term rLm4}))

 |> snd o (Quotient_Def.quotient_lift_const [] ("fv_trm4", @{term fv_rtrm4})))

*}

print_theorems

lemma fv_rtrm4_rsp:

  "xa \<approx>4 ya \<Longrightarrow> fv_rtrm4 xa = fv_rtrm4 ya"

  "x \<approx>4l y \<Longrightarrow> fv_rtrm4_list x = fv_rtrm4_list y"

  apply (induct rule: alpha_rtrm4_alpha_rtrm4_list.inducts)

  apply (simp_all add: alpha_gen)

done

local_setup {* snd o prove_const_rsp [] @{binding fv_rtrm4_rsp'} [@{term fv_rtrm4}]

  (fn _ => asm_full_simp_tac (@{simpset} addsimps @{thms fv_rtrm4_rsp}) 1) *}

print_theorems

local_setup {* snd o prove_const_rsp [] @{binding rVr4_rsp} [@{term rVr4}]

  (fn _ => constr_rsp_tac @{thms alpha4_inj} @{thms fv_rtrm4_rsp alpha4_equivp} 1) *}

local_setup {* snd o prove_const_rsp [] @{binding rLm4_rsp} [@{term rLm4}]

  (fn _ => constr_rsp_tac @{thms alpha4_inj} @{thms fv_rtrm4_rsp alpha4_equivp} 1) *}

lemma [quot_respect]:

  "(alpha_rtrm4 ===> list_rel alpha_rtrm4 ===> alpha_rtrm4) rAp4 rAp4"

  by (simp add: alpha4_inj_fixed)

local_setup {* snd o prove_const_rsp [] @{binding permute_rtrm4_rsp}

  [@{term "permute :: perm \<Rightarrow> rtrm4 \<Rightarrow> rtrm4"}]

  (fn _ => asm_simp_tac (HOL_ss addsimps @{thms alpha4_eqvt}) 1) *}

setup {* define_lifted_perms [@{typ trm4}] ["Term4.trm4"] [("permute_trm4", @{term "permute :: perm \<Rightarrow> rtrm4 \<Rightarrow> rtrm4"})] @{thms permute_rtrm4_permute_rtrm4_list_zero permute_rtrm4_permute_rtrm4_list_plus} *}

print_theorems

(* Instead of permute for trm4_list we may need the following 2 lemmas: *)

lemma [quot_preserve]: "(id ---> map rep_trm4 ---> map abs_trm4) permute = permute"

  apply (simp add: expand_fun_eq)

  apply clarify

  apply (rename_tac "pi" x)

  apply (induct_tac x)

  apply simp

  apply simp

  apply (simp add: meta_eq_to_obj_eq[OF permute_trm4_def,simplified expand_fun_eq,simplified])

  done

lemma [quot_respect]: "(op = ===> list_rel alpha_rtrm4 ===> list_rel alpha_rtrm4) permute permute"

  apply simp

  apply (rule allI)+

  apply (induct_tac xa y rule: list_induct2')

  apply simp_all

  apply clarify

  apply (erule alpha4_eqvt)

  done

ML {*

  map (lift_thm [@{typ trm4}] @{context}) @{thms perm_fixed}

*}

ML {* lift_thm [@{typ trm4}] @{context} @{thm rtrm4.induct} *}

ML {*

*}

ML {*

val liftd =

  map (Local_Defs.unfold @{context} @{thms id_simps}) (

    map (Local_Defs.fold @{context} @{thms alphas}) (

      map (lift_thm [@{typ trm4}] @{context}) @{thms alpha4_inj_fixed[unfolded alphas]}

    )

  )

*}

ML {*

  map (lift_thm [@{typ trm4}] @{context})

  (flat (map (distinct_rel @{context} @{thms alpha_rtrm4.cases alpha_rtrm4_list.cases}) [(@{thms rtrm4.distinct},@{term "alpha_rtrm4"})]))

*}

ML {*

  map (lift_thm [@{typ trm4}] @{context}) @{thms eqvts(1-2)[simplified fix3]}

*}

end