src/Pure/drule.ML
author wenzelm
Fri Jan 11 14:53:05 2002 +0100 (2002-01-11)
changeset 12719 41e0d086f8b6
parent 12710 d9e0674653b3
child 12725 7ede865e1fe5
permissions -rw-r--r--
improved forall_elim_vars_safe (no longer invents new indexes);
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(*  Title:      Pure/drule.ML
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    ID:         $Id$
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    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
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    Copyright   1993  University of Cambridge
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Derived rules and other operations on theorems.
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*)
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infix 0 RS RSN RL RLN MRS MRL OF COMP;
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signature BASIC_DRULE =
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sig
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  val mk_implies        : cterm * cterm -> cterm
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  val list_implies      : cterm list * 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 skip_flexpairs    : cterm -> cterm
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  val strip_imp_prems   : cterm -> cterm list
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  val strip_imp_concl   : cterm -> cterm
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  val cprems_of         : thm -> cterm list
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  val read_insts        :
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          Sign.sg -> (indexname -> typ option) * (indexname -> sort option)
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                  -> (indexname -> typ option) * (indexname -> sort option)
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                  -> string list -> (string*string)list
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                  -> (indexname*ctyp)list * (cterm*cterm)list
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  val types_sorts: thm -> (indexname-> typ option) * (indexname-> sort option)
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  val strip_shyps_warning : thm -> thm
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  val forall_intr_list  : cterm list -> thm -> thm
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  val forall_intr_frees : thm -> thm
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  val forall_intr_vars  : thm -> thm
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  val forall_elim_list  : cterm list -> thm -> thm
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  val forall_elim_var   : int -> thm -> thm
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  val forall_elim_vars  : int -> thm -> thm
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  val forall_elim_vars_safe  : thm -> thm
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  val freeze_thaw       : thm -> thm * (thm -> thm)
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  val implies_elim_list : thm -> thm list -> thm
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  val implies_intr_list : cterm list -> thm -> thm
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  val instantiate       :
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    (indexname * ctyp) list * (cterm * cterm) list -> thm -> thm
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  val zero_var_indexes  : thm -> thm
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  val standard          : thm -> thm
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  val standard'         : thm -> thm
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  val rotate_prems      : int -> thm -> thm
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  val rearrange_prems   : int list -> thm -> thm
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  val assume_ax         : theory -> string -> thm
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  val RSN               : thm * (int * thm) -> thm
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  val RS                : thm * thm -> thm
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  val RLN               : thm list * (int * thm list) -> thm list
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  val RL                : thm list * thm list -> thm list
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  val MRS               : thm list * thm -> thm
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  val MRL               : thm list list * thm list -> thm list
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  val OF                : thm * thm list -> thm
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  val compose           : thm * int * thm -> thm list
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  val COMP              : thm * thm -> thm
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  val read_instantiate_sg: Sign.sg -> (string*string)list -> thm -> thm
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  val read_instantiate  : (string*string)list -> thm -> thm
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  val cterm_instantiate : (cterm*cterm)list -> thm -> thm
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  val weak_eq_thm       : thm * thm -> bool
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  val eq_thm_sg         : thm * thm -> bool
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  val size_of_thm       : thm -> int
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  val reflexive_thm     : thm
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  val symmetric_thm     : thm
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  val transitive_thm    : thm
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  val refl_implies      : thm
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  val symmetric_fun     : thm -> thm
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  val extensional       : thm -> thm
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  val imp_cong          : thm
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  val swap_prems_eq     : thm
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  val equal_abs_elim    : cterm  -> thm -> thm
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  val equal_abs_elim_list: cterm list -> thm -> thm
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  val flexpair_abs_elim_list: cterm list -> thm -> thm
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  val asm_rl            : thm
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  val cut_rl            : thm
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  val revcut_rl         : thm
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  val thin_rl           : thm
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  val triv_forall_equality: thm
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  val swap_prems_rl     : thm
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  val equal_intr_rule   : thm
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  val inst              : string -> string -> thm -> thm
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  val instantiate'      : ctyp option list -> cterm option list -> thm -> thm
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  val incr_indexes_wrt  : int list -> ctyp list -> cterm list -> thm list -> thm -> thm
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end;
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signature DRULE =
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sig
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  include BASIC_DRULE
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  val rule_attribute: ('a -> thm -> thm) -> 'a attribute
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  val tag_rule: tag -> thm -> thm
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  val untag_rule: string -> thm -> thm
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  val tag: tag -> 'a attribute
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  val untag: string -> 'a attribute
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  val get_kind: thm -> string
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  val kind: string -> 'a attribute
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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 kind_internal: 'a attribute
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  val has_internal: tag list -> bool
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  val impose_hyps: cterm list -> thm -> thm
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  val close_derivation: thm -> thm
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  val local_standard: thm -> thm
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  val compose_single: thm * int * thm -> thm
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  val add_rule: thm -> thm list -> thm list
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  val del_rule: thm -> thm list -> thm list
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  val add_rules: thm list -> thm list -> thm list
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  val del_rules: thm list -> thm list -> thm list
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  val merge_rules: thm list * thm list -> thm list
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  val norm_hhf_eq: thm
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  val triv_goal: thm
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  val rev_triv_goal: thm
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  val implies_intr_goals: cterm list -> thm -> thm
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  val freeze_all: thm -> thm
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  val mk_triv_goal: cterm -> thm
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  val tvars_of_terms: term list -> (indexname * sort) list
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  val vars_of_terms: term list -> (indexname * typ) list
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  val tvars_of: thm -> (indexname * sort) list
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  val vars_of: thm -> (indexname * typ) list
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  val unvarifyT: thm -> thm
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  val unvarify: thm -> thm
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  val tvars_intr_list: string list -> thm -> thm * (string * indexname) list
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  val remdups_rl: thm
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  val conj_intr: thm -> thm -> thm
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  val conj_intr_list: thm list -> thm
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  val conj_elim: thm -> thm * thm
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  val conj_elim_list: thm -> thm list
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  val conj_elim_precise: int -> thm -> thm list
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  val conj_intr_thm: thm
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end;
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structure Drule: DRULE =
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struct
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(** some cterm->cterm operations: much faster than calling cterm_of! **)
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(** SAME NAMES as in structure Logic: use compound identifiers! **)
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(*dest_implies for cterms. Note T=prop below*)
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fun dest_implies ct =
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    case term_of ct of
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        (Const("==>", _) $ _ $ _) =>
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            let val (ct1,ct2) = Thm.dest_comb ct
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            in  (#2 (Thm.dest_comb ct1), ct2)  end
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      | _ => raise TERM ("dest_implies", [term_of ct]) ;
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fun dest_equals ct =
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    case term_of ct of
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        (Const("==", _) $ _ $ _) =>
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            let val (ct1,ct2) = Thm.dest_comb ct
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            in  (#2 (Thm.dest_comb ct1), ct2)  end
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      | _ => raise TERM ("dest_equals", [term_of ct]) ;
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(*Discard flexflex pairs; return a cterm*)
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fun skip_flexpairs ct =
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    case term_of ct of
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        (Const("==>", _) $ (Const("=?=",_)$_$_) $ _) =>
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            skip_flexpairs (#2 (dest_implies ct))
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      | _ => ct;
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(* A1==>...An==>B  goes to  [A1,...,An], where B is not an implication *)
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fun strip_imp_prems ct =
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    let val (cA,cB) = dest_implies ct
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    in  cA :: strip_imp_prems cB  end
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    handle TERM _ => [];
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(* A1==>...An==>B  goes to B, where B is not an implication *)
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fun strip_imp_concl ct =
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    case term_of ct of (Const("==>", _) $ _ $ _) =>
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        strip_imp_concl (#2 (Thm.dest_comb ct))
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  | _ => ct;
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(*The premises of a theorem, as a cterm list*)
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val cprems_of = strip_imp_prems o skip_flexpairs o cprop_of;
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val proto_sign = Theory.sign_of ProtoPure.thy;
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val implies = cterm_of proto_sign Term.implies;
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(*cterm version of mk_implies*)
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fun mk_implies(A,B) = Thm.capply (Thm.capply implies A) B;
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(*cterm version of list_implies: [A1,...,An], B  goes to [|A1;==>;An|]==>B *)
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fun list_implies([], B) = B
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  | list_implies(A::AS, B) = mk_implies (A, list_implies(AS,B));
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(** reading of instantiations **)
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fun absent ixn =
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  error("No such variable in term: " ^ Syntax.string_of_vname ixn);
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fun inst_failure ixn =
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  error("Instantiation of " ^ Syntax.string_of_vname ixn ^ " fails");
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fun read_insts sign (rtypes,rsorts) (types,sorts) used insts =
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let
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    fun split([],tvs,vs) = (tvs,vs)
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      | split((sv,st)::l,tvs,vs) = (case Symbol.explode sv of
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                  "'"::cs => split(l,(Syntax.indexname cs,st)::tvs,vs)
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                | cs => split(l,tvs,(Syntax.indexname cs,st)::vs));
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    val (tvs,vs) = split(insts,[],[]);
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    fun readT((a,i),st) =
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        let val ixn = ("'" ^ a,i);
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            val S = case rsorts ixn of Some S => S | None => absent ixn;
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            val T = Sign.read_typ (sign,sorts) st;
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        in if Sign.typ_instance sign (T, TVar(ixn,S)) then (ixn,T)
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           else inst_failure ixn
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        end
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    val tye = map readT tvs;
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    fun mkty(ixn,st) = (case rtypes ixn of
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                          Some T => (ixn,(st,typ_subst_TVars tye T))
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                        | None => absent ixn);
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    val ixnsTs = map mkty vs;
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    val ixns = map fst ixnsTs
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    and sTs  = map snd ixnsTs
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    val (cts,tye2) = read_def_cterms(sign,types,sorts) used false sTs;
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    fun mkcVar(ixn,T) =
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        let val U = typ_subst_TVars tye2 T
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        in cterm_of sign (Var(ixn,U)) end
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    val ixnTs = ListPair.zip(ixns, map snd sTs)
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in (map (fn (ixn,T) => (ixn,ctyp_of sign T)) (tye2 @ tye),
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    ListPair.zip(map mkcVar ixnTs,cts))
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end;
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(*** Find the type (sort) associated with a (T)Var or (T)Free in a term
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     Used for establishing default types (of variables) and sorts (of
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     type variables) when reading another term.
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     Index -1 indicates that a (T)Free rather than a (T)Var is wanted.
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***)
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fun types_sorts thm =
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    let val {prop,hyps,...} = rep_thm thm;
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        val big = list_comb(prop,hyps); (* bogus term! *)
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        val vars = map dest_Var (term_vars big);
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        val frees = map dest_Free (term_frees big);
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        val tvars = term_tvars big;
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        val tfrees = term_tfrees big;
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        fun typ(a,i) = if i<0 then assoc(frees,a) else assoc(vars,(a,i));
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        fun sort(a,i) = if i<0 then assoc(tfrees,a) else assoc(tvars,(a,i));
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    in (typ,sort) end;
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(** basic attributes **)
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(* dependent rules *)
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fun rule_attribute f (x, thm) = (x, (f x thm));
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(* add / delete tags *)
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fun map_tags f thm =
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  Thm.put_name_tags (Thm.name_of_thm thm, f (#2 (Thm.get_name_tags thm))) thm;
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fun tag_rule tg = map_tags (fn tgs => if tg mem tgs then tgs else tgs @ [tg]);
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fun untag_rule s = map_tags (filter_out (equal s o #1));
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fun tag tg x = rule_attribute (K (tag_rule tg)) x;
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fun untag s x = rule_attribute (K (untag_rule s)) x;
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fun simple_tag name x = tag (name, []) x;
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(* theorem kinds *)
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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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fun get_kind thm =
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  (case Library.assoc (#2 (Thm.get_name_tags thm), "kind") of
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    Some (k :: _) => k
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  | _ => "unknown");
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fun kind_rule k = tag_rule ("kind", [k]) o untag_rule "kind";
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fun kind k x = if k = "" then x else rule_attribute (K (kind_rule k)) x;
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fun kind_internal x = kind internalK x;
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fun has_internal tags = exists (equal internalK o fst) tags;
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(** Standardization of rules **)
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(*Strip extraneous shyps as far as possible*)
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fun strip_shyps_warning thm =
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  let
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    val str_of_sort = Sign.str_of_sort (Thm.sign_of_thm thm);
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    val thm' = Thm.strip_shyps thm;
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    val xshyps = Thm.extra_shyps thm';
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  in
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    if null xshyps then ()
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    else warning ("Pending sort hypotheses: " ^ commas (map str_of_sort xshyps));
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    thm'
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  end;
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(*Generalization over a list of variables, IGNORING bad ones*)
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fun forall_intr_list [] th = th
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  | forall_intr_list (y::ys) th =
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        let val gth = forall_intr_list ys th
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        in  forall_intr y gth   handle THM _ =>  gth  end;
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(*Generalization over all suitable Free variables*)
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fun forall_intr_frees th =
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    let val {prop,sign,...} = rep_thm th
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    in  forall_intr_list
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         (map (cterm_of sign) (sort (make_ord atless) (term_frees prop)))
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         th
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    end;
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val forall_elim_var = PureThy.forall_elim_var;
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val forall_elim_vars = PureThy.forall_elim_vars;
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fun forall_elim_vars_safe thm =
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   319
  let
wenzelm@12719
   320
    val {sign, prop, maxidx, ...} = Thm.rep_thm thm;
wenzelm@12719
   321
    fun elim (th, (x, T)) = Thm.forall_elim (Thm.cterm_of sign (Var ((x, maxidx + 1), T))) th;
wenzelm@12719
   322
    val vs = Term.strip_all_vars prop;
wenzelm@12719
   323
  in foldl elim (thm, Term.variantlist (map #1 vs, []) ~~ map #2 vs) end;
wenzelm@9554
   324
clasohm@0
   325
(*Specialization over a list of cterms*)
clasohm@0
   326
fun forall_elim_list cts th = foldr (uncurry forall_elim) (rev cts, th);
clasohm@0
   327
wenzelm@11815
   328
(* maps A1,...,An |- B   to   [| A1;...;An |] ==> B  *)
clasohm@0
   329
fun implies_intr_list cAs th = foldr (uncurry implies_intr) (cAs,th);
clasohm@0
   330
clasohm@0
   331
(* maps [| A1;...;An |] ==> B and [A1,...,An]   to   B *)
clasohm@0
   332
fun implies_elim_list impth ths = foldl (uncurry implies_elim) (impth,ths);
clasohm@0
   333
wenzelm@11960
   334
(* maps |- B to A1,...,An |- B *)
wenzelm@11960
   335
fun impose_hyps chyps th =
wenzelm@12092
   336
  let val chyps' = gen_rems (op aconv o apfst Thm.term_of) (chyps, #hyps (Thm.rep_thm th))
wenzelm@12092
   337
  in implies_elim_list (implies_intr_list chyps' th) (map Thm.assume chyps') end;
wenzelm@11960
   338
clasohm@0
   339
(*Reset Var indexes to zero, renaming to preserve distinctness*)
wenzelm@252
   340
fun zero_var_indexes th =
clasohm@0
   341
    let val {prop,sign,...} = rep_thm th;
clasohm@0
   342
        val vars = term_vars prop
clasohm@0
   343
        val bs = foldl add_new_id ([], map (fn Var((a,_),_)=>a) vars)
wenzelm@252
   344
        val inrs = add_term_tvars(prop,[]);
wenzelm@252
   345
        val nms' = rev(foldl add_new_id ([], map (#1 o #1) inrs));
paulson@2266
   346
        val tye = ListPair.map (fn ((v,rs),a) => (v, TVar((a,0),rs)))
wenzelm@8328
   347
                     (inrs, nms')
wenzelm@252
   348
        val ctye = map (fn (v,T) => (v,ctyp_of sign T)) tye;
wenzelm@252
   349
        fun varpairs([],[]) = []
wenzelm@252
   350
          | varpairs((var as Var(v,T)) :: vars, b::bs) =
wenzelm@252
   351
                let val T' = typ_subst_TVars tye T
wenzelm@252
   352
                in (cterm_of sign (Var(v,T')),
wenzelm@252
   353
                    cterm_of sign (Var((b,0),T'))) :: varpairs(vars,bs)
wenzelm@252
   354
                end
wenzelm@252
   355
          | varpairs _ = raise TERM("varpairs", []);
paulson@8129
   356
    in Thm.instantiate (ctye, varpairs(vars,rev bs)) th end;
clasohm@0
   357
clasohm@0
   358
clasohm@0
   359
(*Standard form of object-rule: no hypotheses, Frees, or outer quantifiers;
clasohm@0
   360
    all generality expressed by Vars having index 0.*)
wenzelm@10515
   361
wenzelm@10515
   362
fun close_derivation thm =
wenzelm@10515
   363
  if Thm.get_name_tags thm = ("", []) then Thm.name_thm ("", thm)
wenzelm@10515
   364
  else thm;
wenzelm@10515
   365
berghofe@11512
   366
fun standard' th =
wenzelm@10515
   367
  let val {maxidx,...} = rep_thm th in
wenzelm@10515
   368
    th
wenzelm@10515
   369
    |> implies_intr_hyps
wenzelm@10515
   370
    |> forall_intr_frees |> forall_elim_vars (maxidx + 1)
wenzelm@10515
   371
    |> strip_shyps_warning
berghofe@11512
   372
    |> zero_var_indexes |> Thm.varifyT |> Thm.compress
wenzelm@1218
   373
  end;
wenzelm@1218
   374
berghofe@11512
   375
val standard = close_derivation o standard';
berghofe@11512
   376
wenzelm@12005
   377
fun local_standard th =
wenzelm@12221
   378
  th |> strip_shyps |> zero_var_indexes
wenzelm@12005
   379
  |> Thm.compress |> close_derivation;
wenzelm@12005
   380
clasohm@0
   381
wenzelm@8328
   382
(*Convert all Vars in a theorem to Frees.  Also return a function for
paulson@4610
   383
  reversing that operation.  DOES NOT WORK FOR TYPE VARIABLES.
paulson@4610
   384
  Similar code in type/freeze_thaw*)
paulson@4610
   385
fun freeze_thaw th =
paulson@7248
   386
 let val fth = freezeT th
paulson@7248
   387
     val {prop,sign,...} = rep_thm fth
paulson@7248
   388
 in
paulson@7248
   389
   case term_vars prop of
paulson@7248
   390
       [] => (fth, fn x => x)
paulson@7248
   391
     | vars =>
wenzelm@8328
   392
         let fun newName (Var(ix,_), (pairs,used)) =
wenzelm@8328
   393
                   let val v = variant used (string_of_indexname ix)
wenzelm@8328
   394
                   in  ((ix,v)::pairs, v::used)  end;
wenzelm@8328
   395
             val (alist, _) = foldr newName
wenzelm@8328
   396
                                (vars, ([], add_term_names (prop, [])))
wenzelm@8328
   397
             fun mk_inst (Var(v,T)) =
wenzelm@8328
   398
                 (cterm_of sign (Var(v,T)),
wenzelm@8328
   399
                  cterm_of sign (Free(the (assoc(alist,v)), T)))
wenzelm@8328
   400
             val insts = map mk_inst vars
wenzelm@8328
   401
             fun thaw th' =
wenzelm@8328
   402
                 th' |> forall_intr_list (map #2 insts)
wenzelm@8328
   403
                     |> forall_elim_list (map #1 insts)
wenzelm@8328
   404
         in  (Thm.instantiate ([],insts) fth, thaw)  end
paulson@7248
   405
 end;
paulson@4610
   406
paulson@4610
   407
paulson@7248
   408
(*Rotates a rule's premises to the left by k*)
paulson@7248
   409
val rotate_prems = permute_prems 0;
paulson@4610
   410
oheimb@11163
   411
(* permute prems, where the i-th position in the argument list (counting from 0)
oheimb@11163
   412
   gives the position within the original thm to be transferred to position i.
oheimb@11163
   413
   Any remaining trailing positions are left unchanged. *)
oheimb@11163
   414
val rearrange_prems = let
oheimb@11163
   415
  fun rearr new []      thm = thm
wenzelm@11815
   416
  |   rearr new (p::ps) thm = rearr (new+1)
oheimb@11163
   417
     (map (fn q => if new<=q andalso q<p then q+1 else q) ps)
oheimb@11163
   418
     (permute_prems (new+1) (new-p) (permute_prems new (p-new) thm))
oheimb@11163
   419
  in rearr 0 end;
paulson@4610
   420
wenzelm@252
   421
(*Assume a new formula, read following the same conventions as axioms.
clasohm@0
   422
  Generalizes over Free variables,
clasohm@0
   423
  creates the assumption, and then strips quantifiers.
clasohm@0
   424
  Example is [| ALL x:?A. ?P(x) |] ==> [| ?P(?a) |]
wenzelm@252
   425
             [ !(A,P,a)[| ALL x:A. P(x) |] ==> [| P(a) |] ]    *)
clasohm@0
   426
fun assume_ax thy sP =
wenzelm@6390
   427
    let val sign = Theory.sign_of thy
paulson@4610
   428
        val prop = Logic.close_form (term_of (read_cterm sign (sP, propT)))
lcp@229
   429
    in forall_elim_vars 0 (assume (cterm_of sign prop))  end;
clasohm@0
   430
wenzelm@252
   431
(*Resolution: exactly one resolvent must be produced.*)
clasohm@0
   432
fun tha RSN (i,thb) =
wenzelm@4270
   433
  case Seq.chop (2, biresolution false [(false,tha)] i thb) of
clasohm@0
   434
      ([th],_) => th
clasohm@0
   435
    | ([],_)   => raise THM("RSN: no unifiers", i, [tha,thb])
clasohm@0
   436
    |      _   => raise THM("RSN: multiple unifiers", i, [tha,thb]);
clasohm@0
   437
clasohm@0
   438
(*resolution: P==>Q, Q==>R gives P==>R. *)
clasohm@0
   439
fun tha RS thb = tha RSN (1,thb);
clasohm@0
   440
clasohm@0
   441
(*For joining lists of rules*)
wenzelm@252
   442
fun thas RLN (i,thbs) =
clasohm@0
   443
  let val resolve = biresolution false (map (pair false) thas) i
wenzelm@4270
   444
      fun resb thb = Seq.list_of (resolve thb) handle THM _ => []
paulson@2672
   445
  in  List.concat (map resb thbs)  end;
clasohm@0
   446
clasohm@0
   447
fun thas RL thbs = thas RLN (1,thbs);
clasohm@0
   448
lcp@11
   449
(*Resolve a list of rules against bottom_rl from right to left;
lcp@11
   450
  makes proof trees*)
wenzelm@252
   451
fun rls MRS bottom_rl =
lcp@11
   452
  let fun rs_aux i [] = bottom_rl
wenzelm@252
   453
        | rs_aux i (rl::rls) = rl RSN (i, rs_aux (i+1) rls)
lcp@11
   454
  in  rs_aux 1 rls  end;
lcp@11
   455
lcp@11
   456
(*As above, but for rule lists*)
wenzelm@252
   457
fun rlss MRL bottom_rls =
lcp@11
   458
  let fun rs_aux i [] = bottom_rls
wenzelm@252
   459
        | rs_aux i (rls::rlss) = rls RLN (i, rs_aux (i+1) rlss)
lcp@11
   460
  in  rs_aux 1 rlss  end;
lcp@11
   461
wenzelm@9288
   462
(*A version of MRS with more appropriate argument order*)
wenzelm@9288
   463
fun bottom_rl OF rls = rls MRS bottom_rl;
wenzelm@9288
   464
wenzelm@252
   465
(*compose Q and [...,Qi,Q(i+1),...]==>R to [...,Q(i+1),...]==>R
clasohm@0
   466
  with no lifting or renaming!  Q may contain ==> or meta-quants
clasohm@0
   467
  ALWAYS deletes premise i *)
wenzelm@252
   468
fun compose(tha,i,thb) =
wenzelm@4270
   469
    Seq.list_of (bicompose false (false,tha,0) i thb);
clasohm@0
   470
wenzelm@6946
   471
fun compose_single (tha,i,thb) =
wenzelm@6946
   472
  (case compose (tha,i,thb) of
wenzelm@6946
   473
    [th] => th
wenzelm@6946
   474
  | _ => raise THM ("compose: unique result expected", i, [tha,thb]));
wenzelm@6946
   475
clasohm@0
   476
(*compose Q and [Q1,Q2,...,Qk]==>R to [Q2,...,Qk]==>R getting unique result*)
clasohm@0
   477
fun tha COMP thb =
clasohm@0
   478
    case compose(tha,1,thb) of
wenzelm@252
   479
        [th] => th
clasohm@0
   480
      | _ =>   raise THM("COMP", 1, [tha,thb]);
clasohm@0
   481
wenzelm@4016
   482
(** theorem equality **)
clasohm@0
   483
clasohm@0
   484
(*Do the two theorems have the same signature?*)
wenzelm@252
   485
fun eq_thm_sg (th1,th2) = Sign.eq_sg(#sign(rep_thm th1), #sign(rep_thm th2));
clasohm@0
   486
clasohm@0
   487
(*Useful "distance" function for BEST_FIRST*)
clasohm@0
   488
val size_of_thm = size_of_term o #prop o rep_thm;
clasohm@0
   489
wenzelm@9829
   490
(*maintain lists of theorems --- preserving canonical order*)
wenzelm@9829
   491
fun del_rules rs rules = Library.gen_rems Thm.eq_thm (rules, rs);
wenzelm@9862
   492
fun add_rules rs rules = rs @ del_rules rs rules;
wenzelm@12373
   493
val del_rule = del_rules o single;
wenzelm@12373
   494
val add_rule = add_rules o single;
wenzelm@12283
   495
fun merge_rules (rules1, rules2) = gen_merge_lists' Thm.eq_thm rules1 rules2;
wenzelm@9829
   496
clasohm@0
   497
lcp@1194
   498
(** Mark Staples's weaker version of eq_thm: ignores variable renaming and
lcp@1194
   499
    (some) type variable renaming **)
lcp@1194
   500
lcp@1194
   501
 (* Can't use term_vars, because it sorts the resulting list of variable names.
lcp@1194
   502
    We instead need the unique list noramlised by the order of appearance
lcp@1194
   503
    in the term. *)
lcp@1194
   504
fun term_vars' (t as Var(v,T)) = [t]
lcp@1194
   505
  | term_vars' (Abs(_,_,b)) = term_vars' b
lcp@1194
   506
  | term_vars' (f$a) = (term_vars' f) @ (term_vars' a)
lcp@1194
   507
  | term_vars' _ = [];
lcp@1194
   508
lcp@1194
   509
fun forall_intr_vars th =
lcp@1194
   510
  let val {prop,sign,...} = rep_thm th;
lcp@1194
   511
      val vars = distinct (term_vars' prop);
lcp@1194
   512
  in forall_intr_list (map (cterm_of sign) vars) th end;
lcp@1194
   513
wenzelm@1237
   514
fun weak_eq_thm (tha,thb) =
lcp@1194
   515
    eq_thm(forall_intr_vars (freezeT tha), forall_intr_vars (freezeT thb));
lcp@1194
   516
lcp@1194
   517
lcp@1194
   518
clasohm@0
   519
(*** Meta-Rewriting Rules ***)
clasohm@0
   520
paulson@4610
   521
fun read_prop s = read_cterm proto_sign (s, propT);
paulson@4610
   522
wenzelm@9455
   523
fun store_thm name thm = hd (PureThy.smart_store_thms (name, [thm]));
wenzelm@9455
   524
fun store_standard_thm name thm = store_thm name (standard thm);
wenzelm@12135
   525
fun store_thm_open name thm = hd (PureThy.smart_store_thms_open (name, [thm]));
wenzelm@12135
   526
fun store_standard_thm_open name thm = store_thm_open name (standard' thm);
wenzelm@4016
   527
clasohm@0
   528
val reflexive_thm =
paulson@4610
   529
  let val cx = cterm_of proto_sign (Var(("x",0),TVar(("'a",0),logicS)))
wenzelm@12135
   530
  in store_standard_thm_open "reflexive" (Thm.reflexive cx) end;
clasohm@0
   531
clasohm@0
   532
val symmetric_thm =
paulson@4610
   533
  let val xy = read_prop "x::'a::logic == y"
wenzelm@12135
   534
  in store_standard_thm_open "symmetric" (Thm.implies_intr_hyps (Thm.symmetric (Thm.assume xy))) end;
clasohm@0
   535
clasohm@0
   536
val transitive_thm =
paulson@4610
   537
  let val xy = read_prop "x::'a::logic == y"
paulson@4610
   538
      val yz = read_prop "y::'a::logic == z"
clasohm@0
   539
      val xythm = Thm.assume xy and yzthm = Thm.assume yz
wenzelm@12135
   540
  in store_standard_thm_open "transitive" (Thm.implies_intr yz (Thm.transitive xythm yzthm)) end;
clasohm@0
   541
nipkow@4679
   542
fun symmetric_fun thm = thm RS symmetric_thm;
nipkow@4679
   543
berghofe@11512
   544
fun extensional eq =
berghofe@11512
   545
  let val eq' =
berghofe@11512
   546
    abstract_rule "x" (snd (Thm.dest_comb (fst (dest_equals (cprop_of eq))))) eq
berghofe@11512
   547
  in equal_elim (eta_conversion (cprop_of eq')) eq' end;
berghofe@11512
   548
berghofe@10414
   549
val imp_cong =
berghofe@10414
   550
  let
berghofe@10414
   551
    val ABC = read_prop "PROP A ==> PROP B == PROP C"
berghofe@10414
   552
    val AB = read_prop "PROP A ==> PROP B"
berghofe@10414
   553
    val AC = read_prop "PROP A ==> PROP C"
berghofe@10414
   554
    val A = read_prop "PROP A"
berghofe@10414
   555
  in
wenzelm@12135
   556
    store_standard_thm_open "imp_cong" (implies_intr ABC (equal_intr
berghofe@10414
   557
      (implies_intr AB (implies_intr A
berghofe@10414
   558
        (equal_elim (implies_elim (assume ABC) (assume A))
berghofe@10414
   559
          (implies_elim (assume AB) (assume A)))))
berghofe@10414
   560
      (implies_intr AC (implies_intr A
berghofe@10414
   561
        (equal_elim (symmetric (implies_elim (assume ABC) (assume A)))
berghofe@10414
   562
          (implies_elim (assume AC) (assume A)))))))
berghofe@10414
   563
  end;
berghofe@10414
   564
berghofe@10414
   565
val swap_prems_eq =
berghofe@10414
   566
  let
berghofe@10414
   567
    val ABC = read_prop "PROP A ==> PROP B ==> PROP C"
berghofe@10414
   568
    val BAC = read_prop "PROP B ==> PROP A ==> PROP C"
berghofe@10414
   569
    val A = read_prop "PROP A"
berghofe@10414
   570
    val B = read_prop "PROP B"
berghofe@10414
   571
  in
wenzelm@12135
   572
    store_standard_thm_open "swap_prems_eq" (equal_intr
berghofe@10414
   573
      (implies_intr ABC (implies_intr B (implies_intr A
berghofe@10414
   574
        (implies_elim (implies_elim (assume ABC) (assume A)) (assume B)))))
berghofe@10414
   575
      (implies_intr BAC (implies_intr A (implies_intr B
berghofe@10414
   576
        (implies_elim (implies_elim (assume BAC) (assume B)) (assume A))))))
berghofe@10414
   577
  end;
lcp@229
   578
paulson@9547
   579
val refl_implies = reflexive implies;
clasohm@0
   580
clasohm@0
   581
clasohm@0
   582
(*** Some useful meta-theorems ***)
clasohm@0
   583
clasohm@0
   584
(*The rule V/V, obtains assumption solving for eresolve_tac*)
wenzelm@12135
   585
val asm_rl = store_standard_thm_open "asm_rl" (Thm.trivial (read_prop "PROP ?psi"));
wenzelm@7380
   586
val _ = store_thm "_" asm_rl;
clasohm@0
   587
clasohm@0
   588
(*Meta-level cut rule: [| V==>W; V |] ==> W *)
wenzelm@4016
   589
val cut_rl =
wenzelm@12135
   590
  store_standard_thm_open "cut_rl"
wenzelm@9455
   591
    (Thm.trivial (read_prop "PROP ?psi ==> PROP ?theta"));
clasohm@0
   592
wenzelm@252
   593
(*Generalized elim rule for one conclusion; cut_rl with reversed premises:
clasohm@0
   594
     [| PROP V;  PROP V ==> PROP W |] ==> PROP W *)
clasohm@0
   595
val revcut_rl =
paulson@4610
   596
  let val V = read_prop "PROP V"
paulson@4610
   597
      and VW = read_prop "PROP V ==> PROP W";
wenzelm@4016
   598
  in
wenzelm@12135
   599
    store_standard_thm_open "revcut_rl"
wenzelm@4016
   600
      (implies_intr V (implies_intr VW (implies_elim (assume VW) (assume V))))
clasohm@0
   601
  end;
clasohm@0
   602
lcp@668
   603
(*for deleting an unwanted assumption*)
lcp@668
   604
val thin_rl =
paulson@4610
   605
  let val V = read_prop "PROP V"
paulson@4610
   606
      and W = read_prop "PROP W";
wenzelm@12135
   607
  in store_standard_thm_open "thin_rl" (implies_intr V (implies_intr W (assume W))) end;
lcp@668
   608
clasohm@0
   609
(* (!!x. PROP ?V) == PROP ?V       Allows removal of redundant parameters*)
clasohm@0
   610
val triv_forall_equality =
paulson@4610
   611
  let val V  = read_prop "PROP V"
paulson@4610
   612
      and QV = read_prop "!!x::'a. PROP V"
wenzelm@8086
   613
      and x  = read_cterm proto_sign ("x", TypeInfer.logicT);
wenzelm@4016
   614
  in
wenzelm@12135
   615
    store_standard_thm_open "triv_forall_equality"
berghofe@11512
   616
      (equal_intr (implies_intr QV (forall_elim x (assume QV)))
berghofe@11512
   617
        (implies_intr V  (forall_intr x (assume V))))
clasohm@0
   618
  end;
clasohm@0
   619
nipkow@1756
   620
(* (PROP ?PhiA ==> PROP ?PhiB ==> PROP ?Psi) ==>
nipkow@1756
   621
   (PROP ?PhiB ==> PROP ?PhiA ==> PROP ?Psi)
nipkow@1756
   622
   `thm COMP swap_prems_rl' swaps the first two premises of `thm'
nipkow@1756
   623
*)
nipkow@1756
   624
val swap_prems_rl =
paulson@4610
   625
  let val cmajor = read_prop "PROP PhiA ==> PROP PhiB ==> PROP Psi";
nipkow@1756
   626
      val major = assume cmajor;
paulson@4610
   627
      val cminor1 = read_prop "PROP PhiA";
nipkow@1756
   628
      val minor1 = assume cminor1;
paulson@4610
   629
      val cminor2 = read_prop "PROP PhiB";
nipkow@1756
   630
      val minor2 = assume cminor2;
wenzelm@12135
   631
  in store_standard_thm_open "swap_prems_rl"
nipkow@1756
   632
       (implies_intr cmajor (implies_intr cminor2 (implies_intr cminor1
nipkow@1756
   633
         (implies_elim (implies_elim major minor1) minor2))))
nipkow@1756
   634
  end;
nipkow@1756
   635
nipkow@3653
   636
(* [| PROP ?phi ==> PROP ?psi; PROP ?psi ==> PROP ?phi |]
nipkow@3653
   637
   ==> PROP ?phi == PROP ?psi
wenzelm@8328
   638
   Introduction rule for == as a meta-theorem.
nipkow@3653
   639
*)
nipkow@3653
   640
val equal_intr_rule =
paulson@4610
   641
  let val PQ = read_prop "PROP phi ==> PROP psi"
paulson@4610
   642
      and QP = read_prop "PROP psi ==> PROP phi"
wenzelm@4016
   643
  in
wenzelm@12135
   644
    store_standard_thm_open "equal_intr_rule"
wenzelm@4016
   645
      (implies_intr PQ (implies_intr QP (equal_intr (assume PQ) (assume QP))))
nipkow@3653
   646
  end;
nipkow@3653
   647
wenzelm@4285
   648
wenzelm@12297
   649
(* "[| PROP ?phi; PROP ?phi; PROP ?psi |] ==> PROP ?psi" *)
wenzelm@12297
   650
wenzelm@12297
   651
val remdups_rl =
wenzelm@12297
   652
  let val P = read_prop "PROP phi" and Q = read_prop "PROP psi";
wenzelm@12297
   653
  in store_standard_thm_open "remdups_rl" (implies_intr_list [P, P, Q] (Thm.assume Q)) end;
wenzelm@12297
   654
wenzelm@12297
   655
wenzelm@9554
   656
(*(PROP ?phi ==> (!!x. PROP ?psi(x))) == (!!x. PROP ?phi ==> PROP ?psi(x))
wenzelm@12297
   657
  Rewrite rule for HHF normalization.*)
wenzelm@9554
   658
wenzelm@9554
   659
val norm_hhf_eq =
wenzelm@9554
   660
  let
wenzelm@9554
   661
    val cert = Thm.cterm_of proto_sign;
wenzelm@9554
   662
    val aT = TFree ("'a", Term.logicS);
wenzelm@9554
   663
    val all = Term.all aT;
wenzelm@9554
   664
    val x = Free ("x", aT);
wenzelm@9554
   665
    val phi = Free ("phi", propT);
wenzelm@9554
   666
    val psi = Free ("psi", aT --> propT);
wenzelm@9554
   667
wenzelm@9554
   668
    val cx = cert x;
wenzelm@9554
   669
    val cphi = cert phi;
wenzelm@9554
   670
    val lhs = cert (Logic.mk_implies (phi, all $ Abs ("x", aT, psi $ Bound 0)));
wenzelm@9554
   671
    val rhs = cert (all $ Abs ("x", aT, Logic.mk_implies (phi, psi $ Bound 0)));
wenzelm@9554
   672
  in
wenzelm@9554
   673
    Thm.equal_intr
wenzelm@9554
   674
      (Thm.implies_elim (Thm.assume lhs) (Thm.assume cphi)
wenzelm@9554
   675
        |> Thm.forall_elim cx
wenzelm@9554
   676
        |> Thm.implies_intr cphi
wenzelm@9554
   677
        |> Thm.forall_intr cx
wenzelm@9554
   678
        |> Thm.implies_intr lhs)
wenzelm@9554
   679
      (Thm.implies_elim
wenzelm@9554
   680
          (Thm.assume rhs |> Thm.forall_elim cx) (Thm.assume cphi)
wenzelm@9554
   681
        |> Thm.forall_intr cx
wenzelm@9554
   682
        |> Thm.implies_intr cphi
wenzelm@9554
   683
        |> Thm.implies_intr rhs)
wenzelm@12135
   684
    |> store_standard_thm_open "norm_hhf_eq"
wenzelm@9554
   685
  end;
wenzelm@9554
   686
wenzelm@9554
   687
paulson@8129
   688
(*** Instantiate theorem th, reading instantiations under signature sg ****)
paulson@8129
   689
paulson@8129
   690
(*Version that normalizes the result: Thm.instantiate no longer does that*)
paulson@8129
   691
fun instantiate instpair th = Thm.instantiate instpair th  COMP   asm_rl;
paulson@8129
   692
paulson@8129
   693
fun read_instantiate_sg sg sinsts th =
paulson@8129
   694
    let val ts = types_sorts th;
paulson@8129
   695
        val used = add_term_tvarnames(#prop(rep_thm th),[]);
paulson@8129
   696
    in  instantiate (read_insts sg ts ts used sinsts) th  end;
paulson@8129
   697
paulson@8129
   698
(*Instantiate theorem th, reading instantiations under theory of th*)
paulson@8129
   699
fun read_instantiate sinsts th =
paulson@8129
   700
    read_instantiate_sg (#sign (rep_thm th)) sinsts th;
paulson@8129
   701
paulson@8129
   702
paulson@8129
   703
(*Left-to-right replacements: tpairs = [...,(vi,ti),...].
paulson@8129
   704
  Instantiates distinct Vars by terms, inferring type instantiations. *)
paulson@8129
   705
local
paulson@8129
   706
  fun add_types ((ct,cu), (sign,tye,maxidx)) =
paulson@8129
   707
    let val {sign=signt, t=t, T= T, maxidx=maxt,...} = rep_cterm ct
paulson@8129
   708
        and {sign=signu, t=u, T= U, maxidx=maxu,...} = rep_cterm cu;
paulson@8129
   709
        val maxi = Int.max(maxidx, Int.max(maxt, maxu));
paulson@8129
   710
        val sign' = Sign.merge(sign, Sign.merge(signt, signu))
wenzelm@12527
   711
        val (tye',maxi') = Type.unify (#tsig(Sign.rep_sg sign')) (tye, maxi) (T, U)
wenzelm@10403
   712
          handle Type.TUNIFY => raise TYPE("Ill-typed instantiation", [T,U], [t,u])
paulson@8129
   713
    in  (sign', tye', maxi')  end;
paulson@8129
   714
in
paulson@8129
   715
fun cterm_instantiate ctpairs0 th =
berghofe@8406
   716
  let val (sign,tye,_) = foldr add_types (ctpairs0, (#sign(rep_thm th), Vartab.empty, 0))
berghofe@8406
   717
      fun instT(ct,cu) = let val inst = subst_TVars_Vartab tye
paulson@8129
   718
                         in (cterm_fun inst ct, cterm_fun inst cu) end
paulson@8129
   719
      fun ctyp2 (ix,T) = (ix, ctyp_of sign T)
berghofe@8406
   720
  in  instantiate (map ctyp2 (Vartab.dest tye), map instT ctpairs0) th  end
paulson@8129
   721
  handle TERM _ =>
paulson@8129
   722
           raise THM("cterm_instantiate: incompatible signatures",0,[th])
paulson@8129
   723
       | TYPE (msg, _, _) => raise THM(msg, 0, [th])
paulson@8129
   724
end;
paulson@8129
   725
paulson@8129
   726
paulson@8129
   727
(** Derived rules mainly for METAHYPS **)
paulson@8129
   728
paulson@8129
   729
(*Given the term "a", takes (%x.t)==(%x.u) to t[a/x]==u[a/x]*)
paulson@8129
   730
fun equal_abs_elim ca eqth =
paulson@8129
   731
  let val {sign=signa, t=a, ...} = rep_cterm ca
paulson@8129
   732
      and combth = combination eqth (reflexive ca)
paulson@8129
   733
      val {sign,prop,...} = rep_thm eqth
paulson@8129
   734
      val (abst,absu) = Logic.dest_equals prop
paulson@8129
   735
      val cterm = cterm_of (Sign.merge (sign,signa))
berghofe@10414
   736
  in  transitive (symmetric (beta_conversion false (cterm (abst$a))))
berghofe@10414
   737
           (transitive combth (beta_conversion false (cterm (absu$a))))
paulson@8129
   738
  end
paulson@8129
   739
  handle THM _ => raise THM("equal_abs_elim", 0, [eqth]);
paulson@8129
   740
paulson@8129
   741
(*Calling equal_abs_elim with multiple terms*)
paulson@8129
   742
fun equal_abs_elim_list cts th = foldr (uncurry equal_abs_elim) (rev cts, th);
paulson@8129
   743
paulson@8129
   744
local
paulson@8129
   745
  val alpha = TVar(("'a",0), [])     (*  type ?'a::{}  *)
paulson@8129
   746
  fun err th = raise THM("flexpair_inst: ", 0, [th])
paulson@8129
   747
  fun flexpair_inst def th =
paulson@8129
   748
    let val {prop = Const _ $ t $ u,  sign,...} = rep_thm th
paulson@8129
   749
        val cterm = cterm_of sign
paulson@8129
   750
        fun cvar a = cterm(Var((a,0),alpha))
paulson@8129
   751
        val def' = cterm_instantiate [(cvar"t", cterm t), (cvar"u", cterm u)]
paulson@8129
   752
                   def
paulson@8129
   753
    in  equal_elim def' th
paulson@8129
   754
    end
paulson@8129
   755
    handle THM _ => err th | Bind => err th
paulson@8129
   756
in
paulson@8129
   757
val flexpair_intr = flexpair_inst (symmetric ProtoPure.flexpair_def)
paulson@8129
   758
and flexpair_elim = flexpair_inst ProtoPure.flexpair_def
paulson@8129
   759
end;
paulson@8129
   760
paulson@8129
   761
(*Version for flexflex pairs -- this supports lifting.*)
paulson@8129
   762
fun flexpair_abs_elim_list cts =
paulson@8129
   763
    flexpair_intr o equal_abs_elim_list cts o flexpair_elim;
paulson@8129
   764
paulson@8129
   765
wenzelm@10667
   766
(*** Goal (PROP A) <==> PROP A ***)
wenzelm@4789
   767
wenzelm@4789
   768
local
wenzelm@10667
   769
  val cert = Thm.cterm_of proto_sign;
wenzelm@10667
   770
  val A = Free ("A", propT);
wenzelm@10667
   771
  val G = Logic.mk_goal A;
wenzelm@4789
   772
  val (G_def, _) = freeze_thaw ProtoPure.Goal_def;
wenzelm@4789
   773
in
wenzelm@11741
   774
  val triv_goal = store_thm "triv_goal" (kind_rule internalK (standard
wenzelm@10667
   775
      (Thm.equal_elim (Thm.symmetric G_def) (Thm.assume (cert A)))));
wenzelm@11741
   776
  val rev_triv_goal = store_thm "rev_triv_goal" (kind_rule internalK (standard
wenzelm@10667
   777
      (Thm.equal_elim G_def (Thm.assume (cert G)))));
wenzelm@4789
   778
end;
wenzelm@4789
   779
wenzelm@9460
   780
val mk_cgoal = Thm.capply (Thm.cterm_of proto_sign Logic.goal_const);
wenzelm@6995
   781
fun assume_goal ct = Thm.assume (mk_cgoal ct) RS rev_triv_goal;
wenzelm@6995
   782
wenzelm@11815
   783
fun implies_intr_goals cprops thm =
wenzelm@11815
   784
  implies_elim_list (implies_intr_list cprops thm) (map assume_goal cprops)
wenzelm@11815
   785
  |> implies_intr_list (map mk_cgoal cprops);
wenzelm@11815
   786
wenzelm@4789
   787
wenzelm@4285
   788
wenzelm@5688
   789
(** variations on instantiate **)
wenzelm@4285
   790
paulson@8550
   791
(*shorthand for instantiating just one variable in the current theory*)
paulson@8550
   792
fun inst x t = read_instantiate_sg (sign_of (the_context())) [(x,t)];
paulson@8550
   793
paulson@8550
   794
wenzelm@12495
   795
(* collect vars in left-to-right order *)
wenzelm@4285
   796
wenzelm@12495
   797
fun tvars_of_terms ts = rev (foldl Term.add_tvars ([], ts));
wenzelm@12495
   798
fun vars_of_terms ts = rev (foldl Term.add_vars ([], ts));
wenzelm@5903
   799
wenzelm@5903
   800
fun tvars_of thm = tvars_of_terms [#prop (Thm.rep_thm thm)];
wenzelm@5903
   801
fun vars_of thm = vars_of_terms [#prop (Thm.rep_thm thm)];
wenzelm@4285
   802
wenzelm@4285
   803
wenzelm@4285
   804
(* instantiate by left-to-right occurrence of variables *)
wenzelm@4285
   805
wenzelm@4285
   806
fun instantiate' cTs cts thm =
wenzelm@4285
   807
  let
wenzelm@4285
   808
    fun err msg =
wenzelm@4285
   809
      raise TYPE ("instantiate': " ^ msg,
wenzelm@4285
   810
        mapfilter (apsome Thm.typ_of) cTs,
wenzelm@4285
   811
        mapfilter (apsome Thm.term_of) cts);
wenzelm@4285
   812
wenzelm@4285
   813
    fun inst_of (v, ct) =
wenzelm@4285
   814
      (Thm.cterm_of (#sign (Thm.rep_cterm ct)) (Var v), ct)
wenzelm@4285
   815
        handle TYPE (msg, _, _) => err msg;
wenzelm@4285
   816
wenzelm@4285
   817
    fun zip_vars _ [] = []
wenzelm@4285
   818
      | zip_vars (_ :: vs) (None :: opt_ts) = zip_vars vs opt_ts
wenzelm@4285
   819
      | zip_vars (v :: vs) (Some t :: opt_ts) = (v, t) :: zip_vars vs opt_ts
wenzelm@4285
   820
      | zip_vars [] _ = err "more instantiations than variables in thm";
wenzelm@4285
   821
wenzelm@4285
   822
    (*instantiate types first!*)
wenzelm@4285
   823
    val thm' =
wenzelm@4285
   824
      if forall is_none cTs then thm
wenzelm@4285
   825
      else Thm.instantiate (zip_vars (map fst (tvars_of thm)) cTs, []) thm;
wenzelm@4285
   826
    in
wenzelm@4285
   827
      if forall is_none cts then thm'
wenzelm@4285
   828
      else Thm.instantiate ([], map inst_of (zip_vars (vars_of thm') cts)) thm'
wenzelm@4285
   829
    end;
wenzelm@4285
   830
wenzelm@4285
   831
wenzelm@5688
   832
(* unvarify(T) *)
wenzelm@5688
   833
wenzelm@5688
   834
(*assume thm in standard form, i.e. no frees, 0 var indexes*)
wenzelm@5688
   835
wenzelm@5688
   836
fun unvarifyT thm =
wenzelm@5688
   837
  let
wenzelm@5688
   838
    val cT = Thm.ctyp_of (Thm.sign_of_thm thm);
wenzelm@5688
   839
    val tfrees = map (fn ((x, _), S) => Some (cT (TFree (x, S)))) (tvars_of thm);
wenzelm@5688
   840
  in instantiate' tfrees [] thm end;
wenzelm@5688
   841
wenzelm@5688
   842
fun unvarify raw_thm =
wenzelm@5688
   843
  let
wenzelm@5688
   844
    val thm = unvarifyT raw_thm;
wenzelm@5688
   845
    val ct = Thm.cterm_of (Thm.sign_of_thm thm);
wenzelm@5688
   846
    val frees = map (fn ((x, _), T) => Some (ct (Free (x, T)))) (vars_of thm);
wenzelm@5688
   847
  in instantiate' [] frees thm end;
wenzelm@5688
   848
wenzelm@5688
   849
wenzelm@8605
   850
(* tvars_intr_list *)
wenzelm@8605
   851
wenzelm@8605
   852
fun tfrees_of thm =
wenzelm@8605
   853
  let val {hyps, prop, ...} = Thm.rep_thm thm
wenzelm@8605
   854
  in foldr Term.add_term_tfree_names (prop :: hyps, []) end;
wenzelm@8605
   855
wenzelm@8605
   856
fun tvars_intr_list tfrees thm =
wenzelm@8605
   857
  Thm.varifyT' (tfrees_of thm \\ tfrees) thm;
wenzelm@8605
   858
wenzelm@8605
   859
wenzelm@6435
   860
(* increment var indexes *)
wenzelm@6435
   861
wenzelm@6435
   862
fun incr_indexes_wrt is cTs cts thms =
wenzelm@6435
   863
  let
wenzelm@6435
   864
    val maxidx =
wenzelm@6435
   865
      foldl Int.max (~1, is @
wenzelm@6435
   866
        map (maxidx_of_typ o #T o Thm.rep_ctyp) cTs @
wenzelm@6435
   867
        map (#maxidx o Thm.rep_cterm) cts @
wenzelm@6435
   868
        map (#maxidx o Thm.rep_thm) thms);
berghofe@10414
   869
  in Thm.incr_indexes (maxidx + 1) end;
wenzelm@6435
   870
wenzelm@6435
   871
wenzelm@8328
   872
(* freeze_all *)
wenzelm@8328
   873
wenzelm@8328
   874
(*freeze all (T)Vars; assumes thm in standard form*)
wenzelm@8328
   875
wenzelm@8328
   876
fun freeze_all_TVars thm =
wenzelm@8328
   877
  (case tvars_of thm of
wenzelm@8328
   878
    [] => thm
wenzelm@8328
   879
  | tvars =>
wenzelm@8328
   880
      let val cert = Thm.ctyp_of (Thm.sign_of_thm thm)
wenzelm@8328
   881
      in instantiate' (map (fn ((x, _), S) => Some (cert (TFree (x, S)))) tvars) [] thm end);
wenzelm@8328
   882
wenzelm@8328
   883
fun freeze_all_Vars thm =
wenzelm@8328
   884
  (case vars_of thm of
wenzelm@8328
   885
    [] => thm
wenzelm@8328
   886
  | vars =>
wenzelm@8328
   887
      let val cert = Thm.cterm_of (Thm.sign_of_thm thm)
wenzelm@8328
   888
      in instantiate' [] (map (fn ((x, _), T) => Some (cert (Free (x, T)))) vars) thm end);
wenzelm@8328
   889
wenzelm@8328
   890
val freeze_all = freeze_all_Vars o freeze_all_TVars;
wenzelm@8328
   891
wenzelm@8328
   892
wenzelm@5688
   893
(* mk_triv_goal *)
wenzelm@5688
   894
wenzelm@5688
   895
(*make an initial proof state, "PROP A ==> (PROP A)" *)
paulson@5311
   896
fun mk_triv_goal ct = instantiate' [] [Some ct] triv_goal;
paulson@5311
   897
wenzelm@11975
   898
wenzelm@11975
   899
wenzelm@11975
   900
(** meta-level conjunction **)
wenzelm@11975
   901
wenzelm@11975
   902
local
wenzelm@11975
   903
  val A = read_prop "PROP A";
wenzelm@11975
   904
  val B = read_prop "PROP B";
wenzelm@11975
   905
  val C = read_prop "PROP C";
wenzelm@11975
   906
  val ABC = read_prop "PROP A ==> PROP B ==> PROP C";
wenzelm@11975
   907
wenzelm@11975
   908
  val proj1 =
wenzelm@11975
   909
    forall_intr_list [A, B] (implies_intr_list [A, B] (Thm.assume A))
wenzelm@11975
   910
    |> forall_elim_vars 0;
wenzelm@11975
   911
wenzelm@11975
   912
  val proj2 =
wenzelm@11975
   913
    forall_intr_list [A, B] (implies_intr_list [A, B] (Thm.assume B))
wenzelm@11975
   914
    |> forall_elim_vars 0;
wenzelm@11975
   915
wenzelm@11975
   916
  val conj_intr_rule =
wenzelm@11975
   917
    forall_intr_list [A, B] (implies_intr_list [A, B]
wenzelm@11975
   918
      (Thm.forall_intr C (Thm.implies_intr ABC
wenzelm@11975
   919
        (implies_elim_list (Thm.assume ABC) [Thm.assume A, Thm.assume B]))))
wenzelm@11975
   920
    |> forall_elim_vars 0;
wenzelm@11975
   921
wenzelm@11975
   922
  val incr = incr_indexes_wrt [] [] [];
wenzelm@11975
   923
in
wenzelm@11975
   924
wenzelm@11975
   925
fun conj_intr tha thb = thb COMP (tha COMP incr [tha, thb] conj_intr_rule);
wenzelm@11975
   926
val conj_intr_list = foldr1 (uncurry conj_intr);
wenzelm@11975
   927
wenzelm@11975
   928
fun conj_elim th =
wenzelm@11975
   929
  let val th' = forall_elim_var (#maxidx (Thm.rep_thm th) + 1) th
wenzelm@11975
   930
  in (incr [th'] proj1 COMP th', incr [th'] proj2 COMP th') end;
wenzelm@11975
   931
wenzelm@11975
   932
fun conj_elim_list th =
wenzelm@11975
   933
  let val (th1, th2) = conj_elim th
wenzelm@11975
   934
  in conj_elim_list th1 @ conj_elim_list th2 end handle THM _ => [th];
wenzelm@11975
   935
wenzelm@12135
   936
fun conj_elim_precise 1 th = [th]
wenzelm@12135
   937
  | conj_elim_precise n th =
wenzelm@12135
   938
      let val (th1, th2) = conj_elim th
wenzelm@12135
   939
      in th1 :: conj_elim_precise (n - 1) th2 end;
wenzelm@12135
   940
wenzelm@12135
   941
val conj_intr_thm = store_standard_thm_open "conjunctionI"
wenzelm@12135
   942
  (implies_intr_list [A, B] (conj_intr (Thm.assume A) (Thm.assume B)));
wenzelm@12135
   943
clasohm@0
   944
end;
wenzelm@252
   945
wenzelm@11975
   946
end;
wenzelm@5903
   947
wenzelm@5903
   948
structure BasicDrule: BASIC_DRULE = Drule;
wenzelm@5903
   949
open BasicDrule;