theory IntEx

imports QuotMain

begin

fun

  intrel :: "(nat \<times> nat) \<Rightarrow> (nat \<times> nat) \<Rightarrow> bool" (infix "\<approx>" 50)

where

  "intrel (x, y) (u, v) = (x + v = u + y)"

quotient my_int = "nat \<times> nat" / intrel

  apply(unfold EQUIV_def)

  apply(auto simp add: mem_def expand_fun_eq)

  done

print_theorems

print_quotients

quotient_def 

  ZERO::"my_int"

where

  "ZERO \<equiv> (0::nat, 0::nat)"

term ZERO

thm ZERO_def

quotient_def 

  ONE::"my_int"

where

  "ONE \<equiv> (1::nat, 0::nat)"

term ONE

thm ONE_def

fun

  my_plus :: "(nat \<times> nat) \<Rightarrow> (nat \<times> nat) \<Rightarrow> (nat \<times> nat)"

where

  "my_plus (x, y) (u, v) = (x + u, y + v)"

quotient_def 

  PLUS::"my_int \<Rightarrow> my_int \<Rightarrow> my_int"

where

  "PLUS \<equiv> my_plus"

term PLUS

thm PLUS_def

fun

  my_neg :: "(nat \<times> nat) \<Rightarrow> (nat \<times> nat)"

where

  "my_neg (x, y) = (y, x)"

quotient_def 

  NEG::"my_int \<Rightarrow> my_int"

where

  "NEG \<equiv> my_neg"

term NEG

thm NEG_def

definition

  MINUS :: "my_int \<Rightarrow> my_int \<Rightarrow> my_int"

where

  "MINUS z w = PLUS z (NEG w)"

fun

  my_mult :: "(nat \<times> nat) \<Rightarrow> (nat \<times> nat) \<Rightarrow> (nat \<times> nat)"

where

  "my_mult (x, y) (u, v) = (x*u + y*v, x*v + y*u)"

quotient_def 

  MULT::"my_int \<Rightarrow> my_int \<Rightarrow> my_int"

where

  "MULT \<equiv> my_mult"

term MULT

thm MULT_def

(* NOT SURE WETHER THIS DEFINITION IS CORRECT *)

fun

  my_le :: "(nat \<times> nat) \<Rightarrow> (nat \<times> nat) \<Rightarrow> bool"

where

  "my_le (x, y) (u, v) = (x+v \<le> u+y)"

quotient_def 

  LE :: "my_int \<Rightarrow> my_int \<Rightarrow> bool"

where

  "LE \<equiv> my_le"

term LE

thm LE_def

definition

  LESS :: "my_int \<Rightarrow> my_int \<Rightarrow> bool"

where

  "LESS z w = (LE z w \<and> z \<noteq> w)"

term LESS

thm LESS_def

definition

  ABS :: "my_int \<Rightarrow> my_int"

where

  "ABS i = (if (LESS i ZERO) then (NEG i) else i)"

definition

  SIGN :: "my_int \<Rightarrow> my_int"

where

 "SIGN i = (if i = ZERO then ZERO else if (LESS ZERO i) then ONE else (NEG ONE))"

lemma plus_sym_pre:

  shows "my_plus a b \<approx> my_plus b a"

  apply(cases a)

  apply(cases b)

  apply(auto)

  done

lemma ho_plus_rsp:

  "(intrel ===> intrel ===> intrel) my_plus my_plus"

  by (simp)

ML {* val qty = @{typ "my_int"} *}

ML {* val ty_name = "my_int" *}

ML {* val rsp_thms = @{thms ho_plus_rsp} @ @{thms ho_all_prs ho_ex_prs} *}

ML {* val defs = @{thms PLUS_def} *}

ML {*

fun lift_thm_my_int lthy t =

  lift_thm lthy qty ty_name rsp_thms defs t

*}

ML {* lift_thm_my_int @{context} @{thm plus_sym_pre} *}

lemma plus_assoc_pre:

  shows "my_plus (my_plus i j) k \<approx> my_plus i (my_plus j k)"

  apply (cases i)

  apply (cases j)

  apply (cases k)

  apply (simp)

  done

ML {* lift_thm_my_int @{context} @{thm plus_assoc_pre} *}

lemma ho_tst: "foldl my_plus x [] = x"

apply simp

done

text {* Below is the construction site code used if things do not work *}

ML {* val (rty, rel, rel_refl, rel_eqv) = lookup_quot_data @{context} qty *}

ML {* val (trans2, reps_same, absrep, quot) = lookup_quot_thms @{context} "my_int" *}

(* ML {* val consts = [@{const_name my_plus}] *}*)

ML {* val consts = lookup_quot_consts defs *}

ML {* val t_a = atomize_thm @{thm ho_tst} *}

(*

prove t_r: {* build_regularize_goal t_a rty rel @{context} *}

ML_prf {*   fun tac ctxt =

      (ObjectLogic.full_atomize_tac) THEN'

     REPEAT_ALL_NEW (FIRST' [

      rtac rel_refl,

      atac,

      rtac @{thm universal_twice},

      (rtac @{thm impI} THEN' atac),

      (*rtac @{thm equality_twice},*)

      EqSubst.eqsubst_tac ctxt [0]

        [(@{thm equiv_res_forall} OF [rel_eqv]),

         (@{thm equiv_res_exists} OF [rel_eqv])],

      (rtac @{thm impI} THEN' (asm_full_simp_tac (Simplifier.context ctxt HOL_ss)) THEN' rtac rel_refl),

      (rtac @{thm RIGHT_RES_FORALL_REGULAR})

     ]);*}

apply (atomize(full))

apply (tactic {* tac @{context} 1 *})

apply (auto)

done

ML {* val t_r = @{thm t_r} OF [t_a] *}*)

ML {* val t_r = regularize t_a rty rel rel_eqv rel_refl @{context} *}

ML {*

  val rt = build_repabs_term @{context} t_r consts rty qty

  val rg = Logic.mk_equals ((Thm.prop_of t_r), rt);

*}

*)

lemma foldl_rsp:

  "((IntEx.intrel ===> IntEx.intrel ===> IntEx.intrel) ===>

           IntEx.intrel ===> op = ===> IntEx.intrel)

           foldl foldl"

  apply (simp only:FUN_REL.simps)

  apply (rule allI)

  apply (rule allI)

  apply (rule impI)

  apply (rule allI)

  apply (rule allI)

  apply (rule impI)

  apply (rule allI)

  apply (rule allI)

  apply (rule impI)

  apply (simp only:)

  apply (rule list.induct)

  apply (simp)

  apply (simp only: foldl.simps)

  sorry

ML {* val rsp_thms = @{thm foldl_rsp} :: rsp_thms *}

prove t_t: rg

apply(atomize(full))

ML_prf {* fun r_mk_comb_tac_int lthy = r_mk_comb_tac lthy rty quot rel_refl trans2 rsp_thms *}

apply (tactic {* REPEAT_ALL_NEW (r_mk_comb_tac_int @{context}) 1 *})

done

ML {* val t_t = @{thm Pure.equal_elim_rule1} OF [@{thm t_t},t_r] *}

ML {* val abs = findabs rty (prop_of t_a) *}

ML {* val aps = findaps rty (prop_of t_a); *}

ML {* val simp_lam_prs_thms = map (make_simp_prs_thm @{context} quot @{thm LAMBDA_PRS}) abs *}

(*ML {* val t_t = Toplevel.program (fn () => repabs @{context} @{thm t_r} consts rty qty quot rel_refl trans2 rsp_thms) *}*)

ML {* val (alls, exs) = findallex rty qty (prop_of t_a) *}

ML {* val allthms = map (make_allex_prs_thm @{context} quot @{thm FORALL_PRS}) alls *}

ML {* val t_a = MetaSimplifier.rewrite_rule (allthms) t_t *}

ML {* val t_l = repeat_eqsubst_thm @{context} simp_lam_prs_thms t_a *}

ML {* val defs_sym = add_lower_defs @{context} defs *}

ML {* val t_d = repeat_eqsubst_thm @{context} defs_sym t_l *}

ML {* val t_r = MetaSimplifier.rewrite_rule [reps_same] t_d *}

ML {* ObjectLogic.rulify t_r *}