--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/UnusedQuotMain.thy Wed Nov 25 11:41:42 2009 +0100
@@ -0,0 +1,486 @@
+
+text {* tyRel takes a type and builds a relation that a quantifier over this
+ type needs to respect. *}
+ML {*
+fun tyRel ty rty rel lthy =
+ if Sign.typ_instance (ProofContext.theory_of lthy) (ty, rty)
+ then rel
+ else (case ty of
+ Type (s, tys) =>
+ let
+ val tys_rel = map (fn ty => ty --> ty --> @{typ bool}) tys;
+ val ty_out = ty --> ty --> @{typ bool};
+ val tys_out = tys_rel ---> ty_out;
+ in
+ (case (maps_lookup (ProofContext.theory_of lthy) s) of
+ SOME (info) => list_comb (Const (#relfun info, tys_out),
+ map (fn ty => tyRel ty rty rel lthy) tys)
+ | NONE => HOLogic.eq_const ty
+ )
+ end
+ | _ => HOLogic.eq_const ty)
+*}
+
+(*
+ML {* cterm_of @{theory}
+ (tyRel @{typ "'a \<Rightarrow> 'a list \<Rightarrow> 't \<Rightarrow> 't"} (Logic.varifyT @{typ "'a list"})
+ @{term "f::('a list \<Rightarrow> 'a list \<Rightarrow> bool)"} @{context})
+*}
+*)
+
+
+ML {*
+fun mk_babs ty ty' = Const (@{const_name "Babs"}, [ty' --> @{typ bool}, ty] ---> ty)
+fun mk_ball ty = Const (@{const_name "Ball"}, [ty, ty] ---> @{typ bool})
+fun mk_bex ty = Const (@{const_name "Bex"}, [ty, ty] ---> @{typ bool})
+fun mk_resp ty = Const (@{const_name Respects}, [[ty, ty] ---> @{typ bool}, ty] ---> @{typ bool})
+*}
+
+(* applies f to the subterm of an abstractions, otherwise to the given term *)
+ML {*
+fun apply_subt f trm =
+ case trm of
+ Abs (x, T, t) =>
+ let
+ val (x', t') = Term.dest_abs (x, T, t)
+ in
+ Term.absfree (x', T, f t')
+ end
+ | _ => f trm
+*}
+
+
+
+(* FIXME: if there are more than one quotient, then you have to look up the relation *)
+ML {*
+fun my_reg lthy rel rty trm =
+ case trm of
+ Abs (x, T, t) =>
+ if (needs_lift rty T) then
+ let
+ val rrel = tyRel T rty rel lthy
+ in
+ (mk_babs (fastype_of trm) T) $ (mk_resp T $ rrel) $ (apply_subt (my_reg lthy rel rty) trm)
+ end
+ else
+ Abs(x, T, (apply_subt (my_reg lthy rel rty) t))
+ | Const (@{const_name "All"}, ty) $ (t as Abs (x, T, _)) =>
+ let
+ val ty1 = domain_type ty
+ val ty2 = domain_type ty1
+ val rrel = tyRel T rty rel lthy
+ in
+ if (needs_lift rty T) then
+ (mk_ball ty1) $ (mk_resp ty2 $ rrel) $ (apply_subt (my_reg lthy rel rty) t)
+ else
+ Const (@{const_name "All"}, ty) $ apply_subt (my_reg lthy rel rty) t
+ end
+ | Const (@{const_name "Ex"}, ty) $ (t as Abs (x, T, _)) =>
+ let
+ val ty1 = domain_type ty
+ val ty2 = domain_type ty1
+ val rrel = tyRel T rty rel lthy
+ in
+ if (needs_lift rty T) then
+ (mk_bex ty1) $ (mk_resp ty2 $ rrel) $ (apply_subt (my_reg lthy rel rty) t)
+ else
+ Const (@{const_name "Ex"}, ty) $ apply_subt (my_reg lthy rel rty) t
+ end
+ | Const (@{const_name "op ="}, ty) $ t =>
+ if needs_lift rty (fastype_of t) then
+ (tyRel (fastype_of t) rty rel lthy) $ t (* FIXME: t should be regularised too *)
+ else Const (@{const_name "op ="}, ty) $ (my_reg lthy rel rty t)
+ | t1 $ t2 => (my_reg lthy rel rty t1) $ (my_reg lthy rel rty t2)
+ | _ => trm
+*}
+
+(* For polymorphic types we need to find the type of the Relation term. *)
+(* TODO: we assume that the relation is a Constant. Is this always true? *)
+ML {*
+fun my_reg_inst lthy rel rty trm =
+ case rel of
+ Const (n, _) => Syntax.check_term lthy
+ (my_reg lthy (Const (n, dummyT)) (Logic.varifyT rty) trm)
+*}
+
+(*
+ML {*
+ val r = Free ("R", dummyT);
+ val t = (my_reg_inst @{context} r @{typ "'a list"} @{term "\<forall>(x::'b list). P x"});
+ val t2 = Syntax.check_term @{context} t;
+ cterm_of @{theory} t2
+*}
+*)
+
+text {* Assumes that the given theorem is atomized *}
+ML {*
+ fun build_regularize_goal thm rty rel lthy =
+ Logic.mk_implies
+ ((prop_of thm),
+ (my_reg_inst lthy rel rty (prop_of thm)))
+*}
+
+ML {*
+fun regularize thm rty rel rel_eqv rel_refl lthy =
+ let
+ val goal = build_regularize_goal thm rty rel lthy;
+ 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 implication_twice},
+ EqSubst.eqsubst_tac ctxt [0]
+ [(@{thm equiv_res_forall} OF [rel_eqv]),
+ (@{thm equiv_res_exists} OF [rel_eqv])],
+ (* For a = b \<longrightarrow> a \<approx> b *)
+ (rtac @{thm impI} THEN' (asm_full_simp_tac HOL_ss) THEN' rtac rel_refl),
+ (rtac @{thm RIGHT_RES_FORALL_REGULAR})
+ ]);
+ val cthm = Goal.prove lthy [] [] goal
+ (fn {context, ...} => tac context 1);
+ in
+ cthm OF [thm]
+ end
+*}
+
+(*consts Rl :: "'a list \<Rightarrow> 'a list \<Rightarrow> bool"
+axioms Rl_eq: "EQUIV Rl"
+
+quotient ql = "'a list" / "Rl"
+ by (rule Rl_eq)
+ML {*
+ ctyp_of @{theory} (exchange_ty @{context} (Logic.varifyT @{typ "'a list"}) (Logic.varifyT @{typ "'a ql"}) @{typ "nat list \<Rightarrow> (nat \<times> nat) list"});
+ ctyp_of @{theory} (exchange_ty @{context} (Logic.varifyT @{typ "nat \<times> nat"}) (Logic.varifyT @{typ "int"}) @{typ "nat list \<Rightarrow> (nat \<times> nat) list"})
+*}
+*)
+
+ML {*
+(* returns all subterms where two types differ *)
+fun diff (T, S) Ds =
+ case (T, S) of
+ (TVar v, TVar u) => if v = u then Ds else (T, S)::Ds
+ | (TFree x, TFree y) => if x = y then Ds else (T, S)::Ds
+ | (Type (a, Ts), Type (b, Us)) =>
+ if a = b then diffs (Ts, Us) Ds else (T, S)::Ds
+ | _ => (T, S)::Ds
+and diffs (T::Ts, U::Us) Ds = diffs (Ts, Us) (diff (T, U) Ds)
+ | diffs ([], []) Ds = Ds
+ | diffs _ _ = error "Unequal length of type arguments"
+
+*}
+
+ML {*
+fun build_repabs_term lthy thm consts rty qty =
+ let
+ (* TODO: The rty and qty stored in the quotient_info should
+ be varified, so this will soon not be needed *)
+ val rty = Logic.varifyT rty;
+ val qty = Logic.varifyT qty;
+
+ fun mk_abs tm =
+ let
+ val ty = fastype_of tm
+ in Syntax.check_term lthy ((get_fun_OLD absF (rty, qty) lthy ty) $ tm) end
+ fun mk_repabs tm =
+ let
+ val ty = fastype_of tm
+ in Syntax.check_term lthy ((get_fun_OLD repF (rty, qty) lthy ty) $ (mk_abs tm)) end
+
+ fun is_lifted_const (Const (x, _)) = member (op =) consts x
+ | is_lifted_const _ = false;
+
+ fun build_aux lthy tm =
+ case tm of
+ Abs (a as (_, vty, _)) =>
+ let
+ val (vs, t) = Term.dest_abs a;
+ val v = Free(vs, vty);
+ val t' = lambda v (build_aux lthy t)
+ in
+ if (not (needs_lift rty (fastype_of tm))) then t'
+ else mk_repabs (
+ if not (needs_lift rty vty) then t'
+ else
+ let
+ val v' = mk_repabs v;
+ (* TODO: I believe 'beta' is not needed any more *)
+ val t1 = (* Envir.beta_norm *) (t' $ v')
+ in
+ lambda v t1
+ end)
+ end
+ | x =>
+ case Term.strip_comb tm of
+ (Const(@{const_name Respects}, _), _) => tm
+ | (opp, tms0) =>
+ let
+ val tms = map (build_aux lthy) tms0
+ val ty = fastype_of tm
+ in
+ if (is_lifted_const opp andalso needs_lift rty ty) then
+ mk_repabs (list_comb (opp, tms))
+ else if ((Term.is_Free opp) andalso (length tms > 0) andalso (needs_lift rty ty)) then
+ mk_repabs (list_comb (opp, tms))
+ else if tms = [] then opp
+ else list_comb(opp, tms)
+ end
+ in
+ repeat_eqsubst_prop lthy @{thms id_def_sym}
+ (build_aux lthy (Thm.prop_of thm))
+ end
+*}
+
+text {* Builds provable goals for regularized theorems *}
+ML {*
+fun build_repabs_goal ctxt thm cons rty qty =
+ Logic.mk_equals ((Thm.prop_of thm), (build_repabs_term ctxt thm cons rty qty))
+*}
+
+ML {*
+fun repabs lthy thm consts rty qty quot_thm reflex_thm trans_thm rsp_thms =
+ let
+ val rt = build_repabs_term lthy thm consts rty qty;
+ val rg = Logic.mk_equals ((Thm.prop_of thm), rt);
+ fun tac ctxt = (ObjectLogic.full_atomize_tac) THEN'
+ (REPEAT_ALL_NEW (r_mk_comb_tac ctxt rty quot_thm reflex_thm trans_thm rsp_thms));
+ val cthm = Goal.prove lthy [] [] rg (fn x => tac (#context x) 1);
+ in
+ @{thm Pure.equal_elim_rule1} OF [cthm, thm]
+ end
+*}
+
+
+(* TODO: Check if it behaves properly with varifyed rty *)
+ML {*
+fun findabs_all rty tm =
+ case tm of
+ Abs(_, T, b) =>
+ let
+ val b' = subst_bound ((Free ("x", T)), b);
+ val tys = findabs_all rty b'
+ val ty = fastype_of tm
+ in if needs_lift rty ty then (ty :: tys) else tys
+ end
+ | f $ a => (findabs_all rty f) @ (findabs_all rty a)
+ | _ => [];
+fun findabs rty tm = distinct (op =) (findabs_all rty tm)
+*}
+
+
+(* Currently useful only for LAMBDA_PRS *)
+ML {*
+fun make_simp_prs_thm lthy quot_thm thm typ =
+ let
+ val (_, [lty, rty]) = dest_Type typ;
+ val thy = ProofContext.theory_of lthy;
+ val (lcty, rcty) = (ctyp_of thy lty, ctyp_of thy rty)
+ val inst = [SOME lcty, NONE, SOME rcty];
+ val lpi = Drule.instantiate' inst [] thm;
+ val tac =
+ (compose_tac (false, lpi, 2)) THEN_ALL_NEW
+ (quotient_tac quot_thm);
+ val gc = Drule.strip_imp_concl (cprop_of lpi);
+ val t = Goal.prove_internal [] gc (fn _ => tac 1)
+ in
+ MetaSimplifier.rewrite_rule [@{thm eq_reflection} OF @{thms id_apply}] t
+ end
+*}
+
+ML {*
+fun findallex_all rty qty tm =
+ case tm of
+ Const (@{const_name All}, T) $ (s as (Abs(_, _, b))) =>
+ let
+ val (tya, tye) = findallex_all rty qty s
+ in if needs_lift rty T then
+ ((T :: tya), tye)
+ else (tya, tye) end
+ | Const (@{const_name Ex}, T) $ (s as (Abs(_, _, b))) =>
+ let
+ val (tya, tye) = findallex_all rty qty s
+ in if needs_lift rty T then
+ (tya, (T :: tye))
+ else (tya, tye) end
+ | Abs(_, T, b) =>
+ findallex_all rty qty (subst_bound ((Free ("x", T)), b))
+ | f $ a =>
+ let
+ val (a1, e1) = findallex_all rty qty f;
+ val (a2, e2) = findallex_all rty qty a;
+ in (a1 @ a2, e1 @ e2) end
+ | _ => ([], []);
+*}
+
+ML {*
+fun findallex lthy rty qty tm =
+ let
+ val (a, e) = findallex_all rty qty tm;
+ val (ad, ed) = (map domain_type a, map domain_type e);
+ val (au, eu) = (distinct (op =) ad, distinct (op =) ed);
+ val (rty, qty) = (Logic.varifyT rty, Logic.varifyT qty)
+ in
+ (map (exchange_ty lthy rty qty) au, map (exchange_ty lthy rty qty) eu)
+ end
+*}
+
+ML {*
+fun make_allex_prs_thm lthy quot_thm thm typ =
+ let
+ val (_, [lty, rty]) = dest_Type typ;
+ val thy = ProofContext.theory_of lthy;
+ val (lcty, rcty) = (ctyp_of thy lty, ctyp_of thy rty)
+ val inst = [NONE, SOME lcty];
+ val lpi = Drule.instantiate' inst [] thm;
+ val tac =
+ (compose_tac (false, lpi, 1)) THEN_ALL_NEW
+ (quotient_tac quot_thm);
+ val gc = Drule.strip_imp_concl (cprop_of lpi);
+ val t = Goal.prove_internal [] gc (fn _ => tac 1)
+ val t_noid = MetaSimplifier.rewrite_rule
+ [@{thm eq_reflection} OF @{thms id_apply}] t;
+ val t_sym = @{thm "HOL.sym"} OF [t_noid];
+ val t_eq = @{thm "eq_reflection"} OF [t_sym]
+ in
+ t_eq
+ end
+*}
+
+ML {*
+fun lift_thm lthy qty qty_name rsp_thms defs rthm =
+let
+ val _ = tracing ("raw theorem:\n" ^ Syntax.string_of_term lthy (prop_of rthm))
+
+ val (rty, rel, rel_refl, rel_eqv) = lookup_quot_data lthy qty;
+ val (trans2, reps_same, absrep, quot) = lookup_quot_thms lthy qty_name;
+ val consts = lookup_quot_consts defs;
+ val t_a = atomize_thm rthm;
+
+ val _ = tracing ("raw atomized theorem:\n" ^ Syntax.string_of_term lthy (prop_of t_a))
+
+ val t_r = regularize t_a rty rel rel_eqv rel_refl lthy;
+
+ val _ = tracing ("regularised theorem:\n" ^ Syntax.string_of_term lthy (prop_of t_r))
+
+ val t_t = repabs lthy t_r consts rty qty quot rel_refl trans2 rsp_thms;
+
+ val _ = tracing ("rep/abs injected theorem:\n" ^ Syntax.string_of_term lthy (prop_of t_t))
+
+ val (alls, exs) = findallex lthy rty qty (prop_of t_a);
+ val allthms = map (make_allex_prs_thm lthy quot @{thm FORALL_PRS}) alls
+ val exthms = map (make_allex_prs_thm lthy quot @{thm EXISTS_PRS}) exs
+ val t_a = MetaSimplifier.rewrite_rule (allthms @ exthms) t_t
+
+ val _ = tracing ("??:\n" ^ Syntax.string_of_term lthy (prop_of t_a))
+
+ val abs = findabs rty (prop_of t_a);
+ val aps = findaps rty (prop_of t_a);
+ val app_prs_thms = map (applic_prs lthy rty qty absrep) aps;
+ val lam_prs_thms = map (make_simp_prs_thm lthy quot @{thm LAMBDA_PRS}) abs;
+ val t_l = repeat_eqsubst_thm lthy (lam_prs_thms @ app_prs_thms) t_a;
+
+ val _ = tracing ("??:\n" ^ Syntax.string_of_term lthy (prop_of t_l))
+
+ val defs_sym = flat (map (add_lower_defs lthy) defs);
+ val defs_sym_eq = map (fn x => eq_reflection OF [x]) defs_sym;
+ val t_id = simp_ids lthy t_l;
+
+ val _ = tracing ("??:\n" ^ Syntax.string_of_term lthy (prop_of t_id))
+
+ val t_d0 = MetaSimplifier.rewrite_rule defs_sym_eq t_id;
+
+ val _ = tracing ("??:\n" ^ Syntax.string_of_term lthy (prop_of t_d0))
+
+ val t_d = repeat_eqsubst_thm lthy defs_sym t_d0;
+
+ val _ = tracing ("??:\n" ^ Syntax.string_of_term lthy (prop_of t_d))
+
+ val t_r = MetaSimplifier.rewrite_rule [reps_same] t_d;
+
+ val _ = tracing ("??:\n" ^ Syntax.string_of_term lthy (prop_of t_r))
+
+ val t_rv = ObjectLogic.rulify t_r
+
+ val _ = tracing ("lifted theorem:\n" ^ Syntax.string_of_term lthy (prop_of t_rv))
+in
+ Thm.varifyT t_rv
+end
+*}
+
+ML {*
+fun lift_thm_note qty qty_name rsp_thms defs thm name lthy =
+ let
+ val lifted_thm = lift_thm lthy qty qty_name rsp_thms defs thm;
+ val (_, lthy2) = note (name, lifted_thm) lthy;
+ in
+ lthy2
+ end
+*}
+
+
+ML {*
+fun regularize_goal lthy thm rel_eqv rel_refl qtrm =
+ let
+ val reg_trm = mk_REGULARIZE_goal lthy (prop_of thm) qtrm;
+ fun tac lthy = regularize_tac lthy rel_eqv rel_refl;
+ val cthm = Goal.prove lthy [] [] reg_trm
+ (fn {context, ...} => tac context 1);
+ in
+ cthm OF [thm]
+ end
+*}
+
+ML {*
+fun repabs_goal lthy thm rty quot_thm reflex_thm trans_thm rsp_thms qtrm =
+ let
+ val rg = Syntax.check_term lthy (mk_inj_REPABS_goal lthy ((prop_of thm), qtrm));
+ fun tac ctxt = (ObjectLogic.full_atomize_tac) THEN'
+ (REPEAT_ALL_NEW (r_mk_comb_tac ctxt rty quot_thm reflex_thm trans_thm rsp_thms));
+ val cthm = Goal.prove lthy [] [] rg (fn x => tac (#context x) 1);
+ in
+ @{thm Pure.equal_elim_rule1} OF [cthm, thm]
+ end
+*}
+
+ML {*
+fun lift_thm_goal lthy qty qty_name rsp_thms defs rthm goal =
+let
+ val (rty, rel, rel_refl, rel_eqv) = lookup_quot_data lthy qty;
+ val (trans2, reps_same, absrep, quot) = lookup_quot_thms lthy qty_name;
+ val t_a = atomize_thm rthm;
+ val goal_a = atomize_goal (ProofContext.theory_of lthy) goal;
+ val t_r = regularize_goal lthy t_a rel_eqv rel_refl goal_a;
+ val t_t = repabs_goal lthy t_r rty quot rel_refl trans2 rsp_thms goal_a;
+ val (alls, exs) = findallex lthy rty qty (prop_of t_a);
+ val allthms = map (make_allex_prs_thm lthy quot @{thm FORALL_PRS}) alls
+ val exthms = map (make_allex_prs_thm lthy quot @{thm EXISTS_PRS}) exs
+ val t_a = MetaSimplifier.rewrite_rule (allthms @ exthms) t_t
+ val abs = findabs rty (prop_of t_a);
+ val aps = findaps rty (prop_of t_a);
+ val app_prs_thms = map (applic_prs lthy rty qty absrep) aps;
+ val lam_prs_thms = map (make_simp_prs_thm lthy quot @{thm LAMBDA_PRS}) abs;
+ val t_l = repeat_eqsubst_thm lthy (lam_prs_thms @ app_prs_thms) t_a;
+ val defs_sym = flat (map (add_lower_defs lthy) defs);
+ val defs_sym_eq = map (fn x => eq_reflection OF [x]) defs_sym;
+ val t_id = simp_ids lthy t_l;
+ val t_d0 = MetaSimplifier.rewrite_rule defs_sym_eq t_id;
+ val t_d = repeat_eqsubst_thm lthy defs_sym t_d0;
+ val t_r = MetaSimplifier.rewrite_rule [reps_same] t_d;
+ val t_rv = ObjectLogic.rulify t_r
+in
+ Thm.varifyT t_rv
+end
+*}
+
+ML {*
+fun lift_thm_goal_note lthy qty qty_name rsp_thms defs thm name goal =
+ let
+ val lifted_thm = lift_thm_goal lthy qty qty_name rsp_thms defs thm goal;
+ val (_, lthy2) = note (name, lifted_thm) lthy;
+ in
+ lthy2
+ end
+*}
+