src/Pure/more_thm.ML
author wenzelm
Thu, 31 May 2007 18:31:36 +0200
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child 23170 94e9413bd7fc
permissions -rw-r--r--
moved aconvc to more_thm.ML;
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(*  Title:      Pure/more_thm.ML
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    ID:         $Id$
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    Author:     Makarius
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Further operations on type ctyp/cterm/thm, outside the inference kernel.
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*)
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infix aconvc;
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signature THM =
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sig
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  include THM
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  val mk_binop: cterm -> cterm -> cterm -> cterm
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  val dest_binop: cterm -> cterm * cterm
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  val dest_implies: cterm -> cterm * cterm
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  val dest_equals: cterm -> cterm * cterm
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  val dest_equals_lhs: cterm -> cterm
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  val dest_equals_rhs: cterm -> cterm
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  val lhs_of: thm -> cterm
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  val rhs_of: thm -> cterm
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  val thm_ord: thm * thm -> order
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  val aconvc : cterm * cterm -> bool
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  val eq_thm: thm * thm -> bool
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  val eq_thms: thm list * thm list -> bool
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  val eq_thm_thy: thm * thm -> bool
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  val eq_thm_prop: thm * thm -> bool
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  val equiv_thm: thm * thm -> bool
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  val plain_prop_of: thm -> term
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  val fold_terms: (term -> 'a -> 'a) -> thm -> 'a -> 'a
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  val axiomK: string
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  val assumptionK: string
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  val definitionK: string
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  val theoremK: string
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  val lemmaK: string
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  val corollaryK: string
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  val internalK: string
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  val rule_attribute: (Context.generic -> thm -> thm) -> attribute
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  val declaration_attribute: (thm -> Context.generic -> Context.generic) -> attribute
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  val theory_attributes: attribute list -> theory * thm -> theory * thm
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  val proof_attributes: attribute list -> Proof.context * thm -> Proof.context * thm
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  val no_attributes: 'a -> 'a * 'b list
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  val simple_fact: 'a -> ('a * 'b list) list
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  val read_def_cterms:
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    theory * (indexname -> typ option) * (indexname -> sort option) ->
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    string list -> bool -> (string * typ)list
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    -> cterm list * (indexname * typ)list
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  val read_cterm: theory -> string * typ -> cterm
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end;
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structure Thm: THM =
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struct
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(** basic operations **)
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(* cterm constructors and destructors *)
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fun mk_binop c a b = Thm.capply (Thm.capply c a) b;
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fun dest_binop ct = (Thm.dest_arg1 ct, Thm.dest_arg ct);
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fun dest_implies ct =
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  (case Thm.term_of ct of
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    Const ("==>", _) $ _ $ _ => dest_binop ct
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  | _ => raise TERM ("dest_implies", [Thm.term_of ct]));
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fun dest_equals ct =
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  (case Thm.term_of ct of
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    Const ("==", _) $ _ $ _ => dest_binop ct
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  | _ => raise TERM ("dest_equals", [Thm.term_of ct]));
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fun dest_equals_lhs ct =
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  (case Thm.term_of ct of
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    Const ("==", _) $ _ $ _ => Thm.dest_arg1 ct
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  | _ => raise TERM ("dest_equals_lhs", [Thm.term_of ct]));
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fun dest_equals_rhs ct =
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  (case Thm.term_of ct of
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    Const ("==", _) $ _ $ _ => Thm.dest_arg ct
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  | _ => raise TERM ("dest_equals_rhs", [Thm.term_of ct]));
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val lhs_of = dest_equals_lhs o Thm.cprop_of;
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val rhs_of = dest_equals_rhs o Thm.cprop_of;
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(* thm order: ignores theory context! *)
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fun thm_ord (th1, th2) =
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  let
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    val {shyps = shyps1, hyps = hyps1, tpairs = tpairs1, prop = prop1, ...} = Thm.rep_thm th1;
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    val {shyps = shyps2, hyps = hyps2, tpairs = tpairs2, prop = prop2, ...} = Thm.rep_thm th2;
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  in
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    (case Term.fast_term_ord (prop1, prop2) of
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      EQUAL =>
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        (case list_ord (prod_ord Term.fast_term_ord Term.fast_term_ord) (tpairs1, tpairs2) of
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          EQUAL =>
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            (case list_ord Term.fast_term_ord (hyps1, hyps2) of
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              EQUAL => list_ord Term.sort_ord (shyps1, shyps2)
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            | ord => ord)
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        | ord => ord)
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    | ord => ord)
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  end;
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(* equality *)
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val op aconvc = op aconv o pairself Thm.term_of;
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fun eq_thm ths =
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  Context.joinable (pairself Thm.theory_of_thm ths) andalso
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  thm_ord ths = EQUAL;
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val eq_thms = eq_list eq_thm;
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val eq_thm_thy = eq_thy o pairself Thm.theory_of_thm;
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val eq_thm_prop = op aconv o pairself Thm.full_prop_of;
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(* pattern equivalence *)
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fun equiv_thm ths =
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  Pattern.equiv (Theory.merge (pairself Thm.theory_of_thm ths)) (pairself Thm.full_prop_of ths);
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(* misc operations *)
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fun plain_prop_of raw_thm =
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  let
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    val thm = Thm.strip_shyps raw_thm;
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    fun err msg = raise THM ("plain_prop_of: " ^ msg, 0, [thm]);
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    val {hyps, prop, tpairs, ...} = Thm.rep_thm thm;
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  in
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    if not (null hyps) then
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      err "theorem may not contain hypotheses"
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    else if not (null (Thm.extra_shyps thm)) then
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      err "theorem may not contain sort hypotheses"
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    else if not (null tpairs) then
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      err "theorem may not contain flex-flex pairs"
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    else prop
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  end;
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fun fold_terms f th =
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  let val {tpairs, prop, hyps, ...} = Thm.rep_thm th
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  in fold (fn (t, u) => f t #> f u) tpairs #> f prop #> fold f hyps end;
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(** theorem kinds **)
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val axiomK = "axiom";
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val assumptionK = "assumption";
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val definitionK = "definition";
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val theoremK = "theorem";
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val lemmaK = "lemma";
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val corollaryK = "corollary";
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val internalK = "internal";
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(** attributes **)
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fun rule_attribute f (x, th) = (x, f x th);
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fun declaration_attribute f (x, th) = (f th x, th);
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fun apply_attributes mk dest =
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  let
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    fun app [] = I
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      | app ((f: attribute) :: fs) = fn (x, th) => f (mk x, th) |>> dest |> app fs;
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  in app end;
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val theory_attributes = apply_attributes Context.Theory Context.the_theory;
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val proof_attributes = apply_attributes Context.Proof Context.the_proof;
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fun no_attributes x = (x, []);
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fun simple_fact x = [(x, [])];
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(** read/certify terms (obsolete) **)    (*exception ERROR*)
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fun read_def_cterms (thy, types, sorts) used freeze sTs =
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  let
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    val (ts', tye) = Sign.read_def_terms (thy, types, sorts) used freeze sTs;
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    val cts = map (Thm.cterm_of thy) ts'
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      handle TYPE (msg, _, _) => error msg
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           | TERM (msg, _) => error msg;
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  in (cts, tye) end;
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fun read_cterm thy sT =
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  let val ([ct], _) = read_def_cterms (thy, K NONE, K NONE) [] true [sT]
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  in ct end;
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open Thm;
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end;
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structure Thmtab = TableFun(type key = thm val ord = Thm.thm_ord);