src/Pure/drule.ML
author wenzelm
Thu Jul 18 12:05:51 2002 +0200 (2002-07-18)
changeset 13389 0cbda884a7e5
parent 13368 8f8ba32d148b
child 13569 69a6b3aa0f38
permissions -rw-r--r--
added satisfy_hyps;
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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 gen_all           : 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 eq_thm_sg         : thm * thm -> bool
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  val eq_thm_prop	: thm * thm -> bool
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  val weak_eq_thm       : 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 equal_elim_rule1  : 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 strip_comb: cterm -> cterm * cterm list
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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 satisfy_hyps: thm 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 is_norm_hhf: term -> bool
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  val norm_hhf: Sign.sg -> term -> term
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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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  val abs_def: 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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(*cterm version of strip_comb: maps  f(t1,...,tn)  to  (f, [t1,...,tn]) *)
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fun strip_comb ct = 
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  let
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    fun stripc (p as (ct, cts)) =
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      let val (ct1, ct2) = Thm.dest_comb ct
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      in stripc (ct1, ct2 :: cts) end handle CTERM _ => p
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  in stripc (ct, []) end;
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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
clasohm@0
   318
  | forall_intr_list (y::ys) th =
wenzelm@252
   319
        let val gth = forall_intr_list ys th
wenzelm@252
   320
        in  forall_intr y gth   handle THM _ =>  gth  end;
clasohm@0
   321
clasohm@0
   322
(*Generalization over all suitable Free variables*)
clasohm@0
   323
fun forall_intr_frees th =
clasohm@0
   324
    let val {prop,sign,...} = rep_thm th
clasohm@0
   325
    in  forall_intr_list
wenzelm@4440
   326
         (map (cterm_of sign) (sort (make_ord atless) (term_frees prop)))
clasohm@0
   327
         th
clasohm@0
   328
    end;
clasohm@0
   329
wenzelm@7898
   330
val forall_elim_var = PureThy.forall_elim_var;
wenzelm@7898
   331
val forall_elim_vars = PureThy.forall_elim_vars;
clasohm@0
   332
wenzelm@12725
   333
fun gen_all thm =
wenzelm@12719
   334
  let
wenzelm@12719
   335
    val {sign, prop, maxidx, ...} = Thm.rep_thm thm;
wenzelm@12719
   336
    fun elim (th, (x, T)) = Thm.forall_elim (Thm.cterm_of sign (Var ((x, maxidx + 1), T))) th;
wenzelm@12719
   337
    val vs = Term.strip_all_vars prop;
wenzelm@12719
   338
  in foldl elim (thm, Term.variantlist (map #1 vs, []) ~~ map #2 vs) end;
wenzelm@9554
   339
clasohm@0
   340
(*Specialization over a list of cterms*)
clasohm@0
   341
fun forall_elim_list cts th = foldr (uncurry forall_elim) (rev cts, th);
clasohm@0
   342
wenzelm@11815
   343
(* maps A1,...,An |- B   to   [| A1;...;An |] ==> B  *)
clasohm@0
   344
fun implies_intr_list cAs th = foldr (uncurry implies_intr) (cAs,th);
clasohm@0
   345
clasohm@0
   346
(* maps [| A1;...;An |] ==> B and [A1,...,An]   to   B *)
clasohm@0
   347
fun implies_elim_list impth ths = foldl (uncurry implies_elim) (impth,ths);
clasohm@0
   348
wenzelm@11960
   349
(* maps |- B to A1,...,An |- B *)
wenzelm@11960
   350
fun impose_hyps chyps th =
wenzelm@12092
   351
  let val chyps' = gen_rems (op aconv o apfst Thm.term_of) (chyps, #hyps (Thm.rep_thm th))
wenzelm@12092
   352
  in implies_elim_list (implies_intr_list chyps' th) (map Thm.assume chyps') end;
wenzelm@11960
   353
wenzelm@13389
   354
(* maps A1,...,An and A1,...,An |- B to |- B *)
wenzelm@13389
   355
fun satisfy_hyps ths th =
wenzelm@13389
   356
  implies_elim_list (implies_intr_list (map (#prop o Thm.crep_thm) ths) th) ths;
wenzelm@13389
   357
clasohm@0
   358
(*Reset Var indexes to zero, renaming to preserve distinctness*)
wenzelm@252
   359
fun zero_var_indexes th =
clasohm@0
   360
    let val {prop,sign,...} = rep_thm th;
clasohm@0
   361
        val vars = term_vars prop
clasohm@0
   362
        val bs = foldl add_new_id ([], map (fn Var((a,_),_)=>a) vars)
wenzelm@252
   363
        val inrs = add_term_tvars(prop,[]);
wenzelm@252
   364
        val nms' = rev(foldl add_new_id ([], map (#1 o #1) inrs));
paulson@2266
   365
        val tye = ListPair.map (fn ((v,rs),a) => (v, TVar((a,0),rs)))
wenzelm@8328
   366
                     (inrs, nms')
wenzelm@252
   367
        val ctye = map (fn (v,T) => (v,ctyp_of sign T)) tye;
wenzelm@252
   368
        fun varpairs([],[]) = []
wenzelm@252
   369
          | varpairs((var as Var(v,T)) :: vars, b::bs) =
wenzelm@252
   370
                let val T' = typ_subst_TVars tye T
wenzelm@252
   371
                in (cterm_of sign (Var(v,T')),
wenzelm@252
   372
                    cterm_of sign (Var((b,0),T'))) :: varpairs(vars,bs)
wenzelm@252
   373
                end
wenzelm@252
   374
          | varpairs _ = raise TERM("varpairs", []);
paulson@8129
   375
    in Thm.instantiate (ctye, varpairs(vars,rev bs)) th end;
clasohm@0
   376
clasohm@0
   377
clasohm@0
   378
(*Standard form of object-rule: no hypotheses, Frees, or outer quantifiers;
clasohm@0
   379
    all generality expressed by Vars having index 0.*)
wenzelm@10515
   380
wenzelm@10515
   381
fun close_derivation thm =
wenzelm@10515
   382
  if Thm.get_name_tags thm = ("", []) then Thm.name_thm ("", thm)
wenzelm@10515
   383
  else thm;
wenzelm@10515
   384
berghofe@11512
   385
fun standard' th =
wenzelm@10515
   386
  let val {maxidx,...} = rep_thm th in
wenzelm@10515
   387
    th
wenzelm@10515
   388
    |> implies_intr_hyps
wenzelm@10515
   389
    |> forall_intr_frees |> forall_elim_vars (maxidx + 1)
wenzelm@10515
   390
    |> strip_shyps_warning
berghofe@11512
   391
    |> zero_var_indexes |> Thm.varifyT |> Thm.compress
wenzelm@1218
   392
  end;
wenzelm@1218
   393
berghofe@11512
   394
val standard = close_derivation o standard';
berghofe@11512
   395
wenzelm@12005
   396
fun local_standard th =
wenzelm@12221
   397
  th |> strip_shyps |> zero_var_indexes
wenzelm@12005
   398
  |> Thm.compress |> close_derivation;
wenzelm@12005
   399
clasohm@0
   400
wenzelm@8328
   401
(*Convert all Vars in a theorem to Frees.  Also return a function for
paulson@4610
   402
  reversing that operation.  DOES NOT WORK FOR TYPE VARIABLES.
paulson@4610
   403
  Similar code in type/freeze_thaw*)
paulson@4610
   404
fun freeze_thaw th =
paulson@7248
   405
 let val fth = freezeT th
paulson@7248
   406
     val {prop,sign,...} = rep_thm fth
paulson@7248
   407
 in
paulson@7248
   408
   case term_vars prop of
paulson@7248
   409
       [] => (fth, fn x => x)
paulson@7248
   410
     | vars =>
wenzelm@8328
   411
         let fun newName (Var(ix,_), (pairs,used)) =
wenzelm@8328
   412
                   let val v = variant used (string_of_indexname ix)
wenzelm@8328
   413
                   in  ((ix,v)::pairs, v::used)  end;
wenzelm@8328
   414
             val (alist, _) = foldr newName
wenzelm@8328
   415
                                (vars, ([], add_term_names (prop, [])))
wenzelm@8328
   416
             fun mk_inst (Var(v,T)) =
wenzelm@8328
   417
                 (cterm_of sign (Var(v,T)),
wenzelm@8328
   418
                  cterm_of sign (Free(the (assoc(alist,v)), T)))
wenzelm@8328
   419
             val insts = map mk_inst vars
wenzelm@8328
   420
             fun thaw th' =
wenzelm@8328
   421
                 th' |> forall_intr_list (map #2 insts)
wenzelm@8328
   422
                     |> forall_elim_list (map #1 insts)
wenzelm@8328
   423
         in  (Thm.instantiate ([],insts) fth, thaw)  end
paulson@7248
   424
 end;
paulson@4610
   425
paulson@4610
   426
paulson@7248
   427
(*Rotates a rule's premises to the left by k*)
paulson@7248
   428
val rotate_prems = permute_prems 0;
paulson@4610
   429
oheimb@11163
   430
(* permute prems, where the i-th position in the argument list (counting from 0)
oheimb@11163
   431
   gives the position within the original thm to be transferred to position i.
oheimb@11163
   432
   Any remaining trailing positions are left unchanged. *)
oheimb@11163
   433
val rearrange_prems = let
oheimb@11163
   434
  fun rearr new []      thm = thm
wenzelm@11815
   435
  |   rearr new (p::ps) thm = rearr (new+1)
oheimb@11163
   436
     (map (fn q => if new<=q andalso q<p then q+1 else q) ps)
oheimb@11163
   437
     (permute_prems (new+1) (new-p) (permute_prems new (p-new) thm))
oheimb@11163
   438
  in rearr 0 end;
paulson@4610
   439
wenzelm@252
   440
(*Assume a new formula, read following the same conventions as axioms.
clasohm@0
   441
  Generalizes over Free variables,
clasohm@0
   442
  creates the assumption, and then strips quantifiers.
clasohm@0
   443
  Example is [| ALL x:?A. ?P(x) |] ==> [| ?P(?a) |]
wenzelm@252
   444
             [ !(A,P,a)[| ALL x:A. P(x) |] ==> [| P(a) |] ]    *)
clasohm@0
   445
fun assume_ax thy sP =
wenzelm@6390
   446
    let val sign = Theory.sign_of thy
paulson@4610
   447
        val prop = Logic.close_form (term_of (read_cterm sign (sP, propT)))
lcp@229
   448
    in forall_elim_vars 0 (assume (cterm_of sign prop))  end;
clasohm@0
   449
wenzelm@252
   450
(*Resolution: exactly one resolvent must be produced.*)
clasohm@0
   451
fun tha RSN (i,thb) =
wenzelm@4270
   452
  case Seq.chop (2, biresolution false [(false,tha)] i thb) of
clasohm@0
   453
      ([th],_) => th
clasohm@0
   454
    | ([],_)   => raise THM("RSN: no unifiers", i, [tha,thb])
clasohm@0
   455
    |      _   => raise THM("RSN: multiple unifiers", i, [tha,thb]);
clasohm@0
   456
clasohm@0
   457
(*resolution: P==>Q, Q==>R gives P==>R. *)
clasohm@0
   458
fun tha RS thb = tha RSN (1,thb);
clasohm@0
   459
clasohm@0
   460
(*For joining lists of rules*)
wenzelm@252
   461
fun thas RLN (i,thbs) =
clasohm@0
   462
  let val resolve = biresolution false (map (pair false) thas) i
wenzelm@4270
   463
      fun resb thb = Seq.list_of (resolve thb) handle THM _ => []
paulson@2672
   464
  in  List.concat (map resb thbs)  end;
clasohm@0
   465
clasohm@0
   466
fun thas RL thbs = thas RLN (1,thbs);
clasohm@0
   467
lcp@11
   468
(*Resolve a list of rules against bottom_rl from right to left;
lcp@11
   469
  makes proof trees*)
wenzelm@252
   470
fun rls MRS bottom_rl =
lcp@11
   471
  let fun rs_aux i [] = bottom_rl
wenzelm@252
   472
        | rs_aux i (rl::rls) = rl RSN (i, rs_aux (i+1) rls)
lcp@11
   473
  in  rs_aux 1 rls  end;
lcp@11
   474
lcp@11
   475
(*As above, but for rule lists*)
wenzelm@252
   476
fun rlss MRL bottom_rls =
lcp@11
   477
  let fun rs_aux i [] = bottom_rls
wenzelm@252
   478
        | rs_aux i (rls::rlss) = rls RLN (i, rs_aux (i+1) rlss)
lcp@11
   479
  in  rs_aux 1 rlss  end;
lcp@11
   480
wenzelm@9288
   481
(*A version of MRS with more appropriate argument order*)
wenzelm@9288
   482
fun bottom_rl OF rls = rls MRS bottom_rl;
wenzelm@9288
   483
wenzelm@252
   484
(*compose Q and [...,Qi,Q(i+1),...]==>R to [...,Q(i+1),...]==>R
clasohm@0
   485
  with no lifting or renaming!  Q may contain ==> or meta-quants
clasohm@0
   486
  ALWAYS deletes premise i *)
wenzelm@252
   487
fun compose(tha,i,thb) =
wenzelm@4270
   488
    Seq.list_of (bicompose false (false,tha,0) i thb);
clasohm@0
   489
wenzelm@6946
   490
fun compose_single (tha,i,thb) =
wenzelm@6946
   491
  (case compose (tha,i,thb) of
wenzelm@6946
   492
    [th] => th
wenzelm@6946
   493
  | _ => raise THM ("compose: unique result expected", i, [tha,thb]));
wenzelm@6946
   494
clasohm@0
   495
(*compose Q and [Q1,Q2,...,Qk]==>R to [Q2,...,Qk]==>R getting unique result*)
clasohm@0
   496
fun tha COMP thb =
clasohm@0
   497
    case compose(tha,1,thb) of
wenzelm@252
   498
        [th] => th
clasohm@0
   499
      | _ =>   raise THM("COMP", 1, [tha,thb]);
clasohm@0
   500
wenzelm@13105
   501
wenzelm@4016
   502
(** theorem equality **)
clasohm@0
   503
wenzelm@13105
   504
val eq_thm_sg = Sign.eq_sg o pairself Thm.sign_of_thm;
wenzelm@13105
   505
val eq_thm_prop = op aconv o pairself Thm.prop_of;
clasohm@0
   506
clasohm@0
   507
(*Useful "distance" function for BEST_FIRST*)
wenzelm@12800
   508
val size_of_thm = size_of_term o prop_of;
clasohm@0
   509
wenzelm@9829
   510
(*maintain lists of theorems --- preserving canonical order*)
wenzelm@13105
   511
fun del_rules rs rules = Library.gen_rems eq_thm_prop (rules, rs);
wenzelm@9862
   512
fun add_rules rs rules = rs @ del_rules rs rules;
wenzelm@12373
   513
val del_rule = del_rules o single;
wenzelm@12373
   514
val add_rule = add_rules o single;
wenzelm@13105
   515
fun merge_rules (rules1, rules2) = gen_merge_lists' eq_thm_prop rules1 rules2;
wenzelm@9829
   516
clasohm@0
   517
lcp@1194
   518
(** Mark Staples's weaker version of eq_thm: ignores variable renaming and
lcp@1194
   519
    (some) type variable renaming **)
lcp@1194
   520
lcp@1194
   521
 (* Can't use term_vars, because it sorts the resulting list of variable names.
lcp@1194
   522
    We instead need the unique list noramlised by the order of appearance
lcp@1194
   523
    in the term. *)
lcp@1194
   524
fun term_vars' (t as Var(v,T)) = [t]
lcp@1194
   525
  | term_vars' (Abs(_,_,b)) = term_vars' b
lcp@1194
   526
  | term_vars' (f$a) = (term_vars' f) @ (term_vars' a)
lcp@1194
   527
  | term_vars' _ = [];
lcp@1194
   528
lcp@1194
   529
fun forall_intr_vars th =
lcp@1194
   530
  let val {prop,sign,...} = rep_thm th;
lcp@1194
   531
      val vars = distinct (term_vars' prop);
lcp@1194
   532
  in forall_intr_list (map (cterm_of sign) vars) th end;
lcp@1194
   533
wenzelm@13105
   534
val weak_eq_thm = Thm.eq_thm o pairself (forall_intr_vars o freezeT);
lcp@1194
   535
lcp@1194
   536
clasohm@0
   537
(*** Meta-Rewriting Rules ***)
clasohm@0
   538
paulson@4610
   539
fun read_prop s = read_cterm proto_sign (s, propT);
paulson@4610
   540
wenzelm@9455
   541
fun store_thm name thm = hd (PureThy.smart_store_thms (name, [thm]));
wenzelm@9455
   542
fun store_standard_thm name thm = store_thm name (standard thm);
wenzelm@12135
   543
fun store_thm_open name thm = hd (PureThy.smart_store_thms_open (name, [thm]));
wenzelm@12135
   544
fun store_standard_thm_open name thm = store_thm_open name (standard' thm);
wenzelm@4016
   545
clasohm@0
   546
val reflexive_thm =
paulson@4610
   547
  let val cx = cterm_of proto_sign (Var(("x",0),TVar(("'a",0),logicS)))
wenzelm@12135
   548
  in store_standard_thm_open "reflexive" (Thm.reflexive cx) end;
clasohm@0
   549
clasohm@0
   550
val symmetric_thm =
paulson@4610
   551
  let val xy = read_prop "x::'a::logic == y"
wenzelm@12135
   552
  in store_standard_thm_open "symmetric" (Thm.implies_intr_hyps (Thm.symmetric (Thm.assume xy))) end;
clasohm@0
   553
clasohm@0
   554
val transitive_thm =
paulson@4610
   555
  let val xy = read_prop "x::'a::logic == y"
paulson@4610
   556
      val yz = read_prop "y::'a::logic == z"
clasohm@0
   557
      val xythm = Thm.assume xy and yzthm = Thm.assume yz
wenzelm@12135
   558
  in store_standard_thm_open "transitive" (Thm.implies_intr yz (Thm.transitive xythm yzthm)) end;
clasohm@0
   559
nipkow@4679
   560
fun symmetric_fun thm = thm RS symmetric_thm;
nipkow@4679
   561
berghofe@11512
   562
fun extensional eq =
berghofe@11512
   563
  let val eq' =
berghofe@11512
   564
    abstract_rule "x" (snd (Thm.dest_comb (fst (dest_equals (cprop_of eq))))) eq
berghofe@11512
   565
  in equal_elim (eta_conversion (cprop_of eq')) eq' end;
berghofe@11512
   566
berghofe@10414
   567
val imp_cong =
berghofe@10414
   568
  let
berghofe@10414
   569
    val ABC = read_prop "PROP A ==> PROP B == PROP C"
berghofe@10414
   570
    val AB = read_prop "PROP A ==> PROP B"
berghofe@10414
   571
    val AC = read_prop "PROP A ==> PROP C"
berghofe@10414
   572
    val A = read_prop "PROP A"
berghofe@10414
   573
  in
wenzelm@12135
   574
    store_standard_thm_open "imp_cong" (implies_intr ABC (equal_intr
berghofe@10414
   575
      (implies_intr AB (implies_intr A
berghofe@10414
   576
        (equal_elim (implies_elim (assume ABC) (assume A))
berghofe@10414
   577
          (implies_elim (assume AB) (assume A)))))
berghofe@10414
   578
      (implies_intr AC (implies_intr A
berghofe@10414
   579
        (equal_elim (symmetric (implies_elim (assume ABC) (assume A)))
berghofe@10414
   580
          (implies_elim (assume AC) (assume A)))))))
berghofe@10414
   581
  end;
berghofe@10414
   582
berghofe@10414
   583
val swap_prems_eq =
berghofe@10414
   584
  let
berghofe@10414
   585
    val ABC = read_prop "PROP A ==> PROP B ==> PROP C"
berghofe@10414
   586
    val BAC = read_prop "PROP B ==> PROP A ==> PROP C"
berghofe@10414
   587
    val A = read_prop "PROP A"
berghofe@10414
   588
    val B = read_prop "PROP B"
berghofe@10414
   589
  in
wenzelm@12135
   590
    store_standard_thm_open "swap_prems_eq" (equal_intr
berghofe@10414
   591
      (implies_intr ABC (implies_intr B (implies_intr A
berghofe@10414
   592
        (implies_elim (implies_elim (assume ABC) (assume A)) (assume B)))))
berghofe@10414
   593
      (implies_intr BAC (implies_intr A (implies_intr B
berghofe@10414
   594
        (implies_elim (implies_elim (assume BAC) (assume B)) (assume A))))))
berghofe@10414
   595
  end;
lcp@229
   596
paulson@9547
   597
val refl_implies = reflexive implies;
clasohm@0
   598
berghofe@13325
   599
fun abs_def thm =
berghofe@13325
   600
  let
berghofe@13325
   601
    val (_, cvs) = strip_comb (fst (dest_equals (cprop_of thm)));
berghofe@13325
   602
    val thm' = foldr (fn (ct, thm) => Thm.abstract_rule
berghofe@13325
   603
      (case term_of ct of Var ((a, _), _) => a | Free (a, _) => a | _ => "x")
berghofe@13325
   604
        ct thm) (cvs, thm)
berghofe@13325
   605
  in transitive
berghofe@13325
   606
    (symmetric (eta_conversion (fst (dest_equals (cprop_of thm'))))) thm'
berghofe@13325
   607
  end;
berghofe@13325
   608
clasohm@0
   609
clasohm@0
   610
(*** Some useful meta-theorems ***)
clasohm@0
   611
clasohm@0
   612
(*The rule V/V, obtains assumption solving for eresolve_tac*)
wenzelm@12135
   613
val asm_rl = store_standard_thm_open "asm_rl" (Thm.trivial (read_prop "PROP ?psi"));
wenzelm@7380
   614
val _ = store_thm "_" asm_rl;
clasohm@0
   615
clasohm@0
   616
(*Meta-level cut rule: [| V==>W; V |] ==> W *)
wenzelm@4016
   617
val cut_rl =
wenzelm@12135
   618
  store_standard_thm_open "cut_rl"
wenzelm@9455
   619
    (Thm.trivial (read_prop "PROP ?psi ==> PROP ?theta"));
clasohm@0
   620
wenzelm@252
   621
(*Generalized elim rule for one conclusion; cut_rl with reversed premises:
clasohm@0
   622
     [| PROP V;  PROP V ==> PROP W |] ==> PROP W *)
clasohm@0
   623
val revcut_rl =
paulson@4610
   624
  let val V = read_prop "PROP V"
paulson@4610
   625
      and VW = read_prop "PROP V ==> PROP W";
wenzelm@4016
   626
  in
wenzelm@12135
   627
    store_standard_thm_open "revcut_rl"
wenzelm@4016
   628
      (implies_intr V (implies_intr VW (implies_elim (assume VW) (assume V))))
clasohm@0
   629
  end;
clasohm@0
   630
lcp@668
   631
(*for deleting an unwanted assumption*)
lcp@668
   632
val thin_rl =
paulson@4610
   633
  let val V = read_prop "PROP V"
paulson@4610
   634
      and W = read_prop "PROP W";
wenzelm@12135
   635
  in store_standard_thm_open "thin_rl" (implies_intr V (implies_intr W (assume W))) end;
lcp@668
   636
clasohm@0
   637
(* (!!x. PROP ?V) == PROP ?V       Allows removal of redundant parameters*)
clasohm@0
   638
val triv_forall_equality =
paulson@4610
   639
  let val V  = read_prop "PROP V"
paulson@4610
   640
      and QV = read_prop "!!x::'a. PROP V"
wenzelm@8086
   641
      and x  = read_cterm proto_sign ("x", TypeInfer.logicT);
wenzelm@4016
   642
  in
wenzelm@12135
   643
    store_standard_thm_open "triv_forall_equality"
berghofe@11512
   644
      (equal_intr (implies_intr QV (forall_elim x (assume QV)))
berghofe@11512
   645
        (implies_intr V  (forall_intr x (assume V))))
clasohm@0
   646
  end;
clasohm@0
   647
nipkow@1756
   648
(* (PROP ?PhiA ==> PROP ?PhiB ==> PROP ?Psi) ==>
nipkow@1756
   649
   (PROP ?PhiB ==> PROP ?PhiA ==> PROP ?Psi)
nipkow@1756
   650
   `thm COMP swap_prems_rl' swaps the first two premises of `thm'
nipkow@1756
   651
*)
nipkow@1756
   652
val swap_prems_rl =
paulson@4610
   653
  let val cmajor = read_prop "PROP PhiA ==> PROP PhiB ==> PROP Psi";
nipkow@1756
   654
      val major = assume cmajor;
paulson@4610
   655
      val cminor1 = read_prop "PROP PhiA";
nipkow@1756
   656
      val minor1 = assume cminor1;
paulson@4610
   657
      val cminor2 = read_prop "PROP PhiB";
nipkow@1756
   658
      val minor2 = assume cminor2;
wenzelm@12135
   659
  in store_standard_thm_open "swap_prems_rl"
nipkow@1756
   660
       (implies_intr cmajor (implies_intr cminor2 (implies_intr cminor1
nipkow@1756
   661
         (implies_elim (implies_elim major minor1) minor2))))
nipkow@1756
   662
  end;
nipkow@1756
   663
nipkow@3653
   664
(* [| PROP ?phi ==> PROP ?psi; PROP ?psi ==> PROP ?phi |]
nipkow@3653
   665
   ==> PROP ?phi == PROP ?psi
wenzelm@8328
   666
   Introduction rule for == as a meta-theorem.
nipkow@3653
   667
*)
nipkow@3653
   668
val equal_intr_rule =
paulson@4610
   669
  let val PQ = read_prop "PROP phi ==> PROP psi"
paulson@4610
   670
      and QP = read_prop "PROP psi ==> PROP phi"
wenzelm@4016
   671
  in
wenzelm@12135
   672
    store_standard_thm_open "equal_intr_rule"
wenzelm@4016
   673
      (implies_intr PQ (implies_intr QP (equal_intr (assume PQ) (assume QP))))
nipkow@3653
   674
  end;
nipkow@3653
   675
wenzelm@13368
   676
(* [| PROP ?phi == PROP ?psi; PROP ?phi |] ==> PROP ?psi *)
wenzelm@13368
   677
val equal_elim_rule1 =
wenzelm@13368
   678
  let val eq = read_prop "PROP phi == PROP psi"
wenzelm@13368
   679
      and P = read_prop "PROP phi"
wenzelm@13368
   680
  in store_standard_thm_open "equal_elim_rule1"
wenzelm@13368
   681
    (Thm.equal_elim (assume eq) (assume P) |> implies_intr_list [eq, P])
wenzelm@13368
   682
  end;
wenzelm@4285
   683
wenzelm@12297
   684
(* "[| PROP ?phi; PROP ?phi; PROP ?psi |] ==> PROP ?psi" *)
wenzelm@12297
   685
wenzelm@12297
   686
val remdups_rl =
wenzelm@12297
   687
  let val P = read_prop "PROP phi" and Q = read_prop "PROP psi";
wenzelm@12297
   688
  in store_standard_thm_open "remdups_rl" (implies_intr_list [P, P, Q] (Thm.assume Q)) end;
wenzelm@12297
   689
wenzelm@12297
   690
wenzelm@9554
   691
(*(PROP ?phi ==> (!!x. PROP ?psi(x))) == (!!x. PROP ?phi ==> PROP ?psi(x))
wenzelm@12297
   692
  Rewrite rule for HHF normalization.*)
wenzelm@9554
   693
wenzelm@9554
   694
val norm_hhf_eq =
wenzelm@9554
   695
  let
wenzelm@9554
   696
    val cert = Thm.cterm_of proto_sign;
wenzelm@9554
   697
    val aT = TFree ("'a", Term.logicS);
wenzelm@9554
   698
    val all = Term.all aT;
wenzelm@9554
   699
    val x = Free ("x", aT);
wenzelm@9554
   700
    val phi = Free ("phi", propT);
wenzelm@9554
   701
    val psi = Free ("psi", aT --> propT);
wenzelm@9554
   702
wenzelm@9554
   703
    val cx = cert x;
wenzelm@9554
   704
    val cphi = cert phi;
wenzelm@9554
   705
    val lhs = cert (Logic.mk_implies (phi, all $ Abs ("x", aT, psi $ Bound 0)));
wenzelm@9554
   706
    val rhs = cert (all $ Abs ("x", aT, Logic.mk_implies (phi, psi $ Bound 0)));
wenzelm@9554
   707
  in
wenzelm@9554
   708
    Thm.equal_intr
wenzelm@9554
   709
      (Thm.implies_elim (Thm.assume lhs) (Thm.assume cphi)
wenzelm@9554
   710
        |> Thm.forall_elim cx
wenzelm@9554
   711
        |> Thm.implies_intr cphi
wenzelm@9554
   712
        |> Thm.forall_intr cx
wenzelm@9554
   713
        |> Thm.implies_intr lhs)
wenzelm@9554
   714
      (Thm.implies_elim
wenzelm@9554
   715
          (Thm.assume rhs |> Thm.forall_elim cx) (Thm.assume cphi)
wenzelm@9554
   716
        |> Thm.forall_intr cx
wenzelm@9554
   717
        |> Thm.implies_intr cphi
wenzelm@9554
   718
        |> Thm.implies_intr rhs)
wenzelm@12135
   719
    |> store_standard_thm_open "norm_hhf_eq"
wenzelm@9554
   720
  end;
wenzelm@9554
   721
wenzelm@12800
   722
fun is_norm_hhf tm =
wenzelm@12800
   723
  let
wenzelm@12800
   724
    fun is_norm (Const ("==>", _) $ _ $ (Const ("all", _) $ _)) = false
wenzelm@12800
   725
      | is_norm (t $ u) = is_norm t andalso is_norm u
wenzelm@12800
   726
      | is_norm (Abs (_, _, t)) = is_norm t
wenzelm@12800
   727
      | is_norm _ = true;
wenzelm@12800
   728
  in is_norm (Pattern.beta_eta_contract tm) end;
wenzelm@12800
   729
wenzelm@12800
   730
fun norm_hhf sg t =
wenzelm@12800
   731
  if is_norm_hhf t then t
berghofe@13198
   732
  else Pattern.rewrite_term (Sign.tsig_of sg) [Logic.dest_equals (prop_of norm_hhf_eq)] [] t;
wenzelm@12800
   733
wenzelm@9554
   734
paulson@8129
   735
(*** Instantiate theorem th, reading instantiations under signature sg ****)
paulson@8129
   736
paulson@8129
   737
(*Version that normalizes the result: Thm.instantiate no longer does that*)
paulson@8129
   738
fun instantiate instpair th = Thm.instantiate instpair th  COMP   asm_rl;
paulson@8129
   739
paulson@8129
   740
fun read_instantiate_sg sg sinsts th =
paulson@8129
   741
    let val ts = types_sorts th;
wenzelm@12800
   742
        val used = add_term_tvarnames (prop_of th, []);
paulson@8129
   743
    in  instantiate (read_insts sg ts ts used sinsts) th  end;
paulson@8129
   744
paulson@8129
   745
(*Instantiate theorem th, reading instantiations under theory of th*)
paulson@8129
   746
fun read_instantiate sinsts th =
paulson@8129
   747
    read_instantiate_sg (#sign (rep_thm th)) sinsts th;
paulson@8129
   748
paulson@8129
   749
paulson@8129
   750
(*Left-to-right replacements: tpairs = [...,(vi,ti),...].
paulson@8129
   751
  Instantiates distinct Vars by terms, inferring type instantiations. *)
paulson@8129
   752
local
paulson@8129
   753
  fun add_types ((ct,cu), (sign,tye,maxidx)) =
paulson@8129
   754
    let val {sign=signt, t=t, T= T, maxidx=maxt,...} = rep_cterm ct
paulson@8129
   755
        and {sign=signu, t=u, T= U, maxidx=maxu,...} = rep_cterm cu;
paulson@8129
   756
        val maxi = Int.max(maxidx, Int.max(maxt, maxu));
paulson@8129
   757
        val sign' = Sign.merge(sign, Sign.merge(signt, signu))
wenzelm@12527
   758
        val (tye',maxi') = Type.unify (#tsig(Sign.rep_sg sign')) (tye, maxi) (T, U)
wenzelm@10403
   759
          handle Type.TUNIFY => raise TYPE("Ill-typed instantiation", [T,U], [t,u])
paulson@8129
   760
    in  (sign', tye', maxi')  end;
paulson@8129
   761
in
paulson@8129
   762
fun cterm_instantiate ctpairs0 th =
berghofe@8406
   763
  let val (sign,tye,_) = foldr add_types (ctpairs0, (#sign(rep_thm th), Vartab.empty, 0))
berghofe@8406
   764
      fun instT(ct,cu) = let val inst = subst_TVars_Vartab tye
paulson@8129
   765
                         in (cterm_fun inst ct, cterm_fun inst cu) end
paulson@8129
   766
      fun ctyp2 (ix,T) = (ix, ctyp_of sign T)
berghofe@8406
   767
  in  instantiate (map ctyp2 (Vartab.dest tye), map instT ctpairs0) th  end
paulson@8129
   768
  handle TERM _ =>
paulson@8129
   769
           raise THM("cterm_instantiate: incompatible signatures",0,[th])
paulson@8129
   770
       | TYPE (msg, _, _) => raise THM(msg, 0, [th])
paulson@8129
   771
end;
paulson@8129
   772
paulson@8129
   773
paulson@8129
   774
(** Derived rules mainly for METAHYPS **)
paulson@8129
   775
paulson@8129
   776
(*Given the term "a", takes (%x.t)==(%x.u) to t[a/x]==u[a/x]*)
paulson@8129
   777
fun equal_abs_elim ca eqth =
paulson@8129
   778
  let val {sign=signa, t=a, ...} = rep_cterm ca
paulson@8129
   779
      and combth = combination eqth (reflexive ca)
paulson@8129
   780
      val {sign,prop,...} = rep_thm eqth
paulson@8129
   781
      val (abst,absu) = Logic.dest_equals prop
paulson@8129
   782
      val cterm = cterm_of (Sign.merge (sign,signa))
berghofe@10414
   783
  in  transitive (symmetric (beta_conversion false (cterm (abst$a))))
berghofe@10414
   784
           (transitive combth (beta_conversion false (cterm (absu$a))))
paulson@8129
   785
  end
paulson@8129
   786
  handle THM _ => raise THM("equal_abs_elim", 0, [eqth]);
paulson@8129
   787
paulson@8129
   788
(*Calling equal_abs_elim with multiple terms*)
paulson@8129
   789
fun equal_abs_elim_list cts th = foldr (uncurry equal_abs_elim) (rev cts, th);
paulson@8129
   790
paulson@8129
   791
local
paulson@8129
   792
  val alpha = TVar(("'a",0), [])     (*  type ?'a::{}  *)
paulson@8129
   793
  fun err th = raise THM("flexpair_inst: ", 0, [th])
paulson@8129
   794
  fun flexpair_inst def th =
paulson@8129
   795
    let val {prop = Const _ $ t $ u,  sign,...} = rep_thm th
paulson@8129
   796
        val cterm = cterm_of sign
paulson@8129
   797
        fun cvar a = cterm(Var((a,0),alpha))
paulson@8129
   798
        val def' = cterm_instantiate [(cvar"t", cterm t), (cvar"u", cterm u)]
paulson@8129
   799
                   def
paulson@8129
   800
    in  equal_elim def' th
paulson@8129
   801
    end
paulson@8129
   802
    handle THM _ => err th | Bind => err th
paulson@8129
   803
in
paulson@8129
   804
val flexpair_intr = flexpair_inst (symmetric ProtoPure.flexpair_def)
paulson@8129
   805
and flexpair_elim = flexpair_inst ProtoPure.flexpair_def
paulson@8129
   806
end;
paulson@8129
   807
paulson@8129
   808
(*Version for flexflex pairs -- this supports lifting.*)
paulson@8129
   809
fun flexpair_abs_elim_list cts =
paulson@8129
   810
    flexpair_intr o equal_abs_elim_list cts o flexpair_elim;
paulson@8129
   811
paulson@8129
   812
wenzelm@10667
   813
(*** Goal (PROP A) <==> PROP A ***)
wenzelm@4789
   814
wenzelm@4789
   815
local
wenzelm@10667
   816
  val cert = Thm.cterm_of proto_sign;
wenzelm@10667
   817
  val A = Free ("A", propT);
wenzelm@10667
   818
  val G = Logic.mk_goal A;
wenzelm@4789
   819
  val (G_def, _) = freeze_thaw ProtoPure.Goal_def;
wenzelm@4789
   820
in
wenzelm@11741
   821
  val triv_goal = store_thm "triv_goal" (kind_rule internalK (standard
wenzelm@10667
   822
      (Thm.equal_elim (Thm.symmetric G_def) (Thm.assume (cert A)))));
wenzelm@11741
   823
  val rev_triv_goal = store_thm "rev_triv_goal" (kind_rule internalK (standard
wenzelm@10667
   824
      (Thm.equal_elim G_def (Thm.assume (cert G)))));
wenzelm@4789
   825
end;
wenzelm@4789
   826
wenzelm@9460
   827
val mk_cgoal = Thm.capply (Thm.cterm_of proto_sign Logic.goal_const);
wenzelm@6995
   828
fun assume_goal ct = Thm.assume (mk_cgoal ct) RS rev_triv_goal;
wenzelm@6995
   829
wenzelm@11815
   830
fun implies_intr_goals cprops thm =
wenzelm@11815
   831
  implies_elim_list (implies_intr_list cprops thm) (map assume_goal cprops)
wenzelm@11815
   832
  |> implies_intr_list (map mk_cgoal cprops);
wenzelm@11815
   833
wenzelm@4789
   834
wenzelm@4285
   835
wenzelm@5688
   836
(** variations on instantiate **)
wenzelm@4285
   837
paulson@8550
   838
(*shorthand for instantiating just one variable in the current theory*)
paulson@8550
   839
fun inst x t = read_instantiate_sg (sign_of (the_context())) [(x,t)];
paulson@8550
   840
paulson@8550
   841
wenzelm@12495
   842
(* collect vars in left-to-right order *)
wenzelm@4285
   843
wenzelm@12495
   844
fun tvars_of_terms ts = rev (foldl Term.add_tvars ([], ts));
wenzelm@12495
   845
fun vars_of_terms ts = rev (foldl Term.add_vars ([], ts));
wenzelm@5903
   846
wenzelm@12800
   847
fun tvars_of thm = tvars_of_terms [prop_of thm];
wenzelm@12800
   848
fun vars_of thm = vars_of_terms [prop_of thm];
wenzelm@4285
   849
wenzelm@4285
   850
wenzelm@4285
   851
(* instantiate by left-to-right occurrence of variables *)
wenzelm@4285
   852
wenzelm@4285
   853
fun instantiate' cTs cts thm =
wenzelm@4285
   854
  let
wenzelm@4285
   855
    fun err msg =
wenzelm@4285
   856
      raise TYPE ("instantiate': " ^ msg,
wenzelm@4285
   857
        mapfilter (apsome Thm.typ_of) cTs,
wenzelm@4285
   858
        mapfilter (apsome Thm.term_of) cts);
wenzelm@4285
   859
wenzelm@4285
   860
    fun inst_of (v, ct) =
wenzelm@4285
   861
      (Thm.cterm_of (#sign (Thm.rep_cterm ct)) (Var v), ct)
wenzelm@4285
   862
        handle TYPE (msg, _, _) => err msg;
wenzelm@4285
   863
wenzelm@4285
   864
    fun zip_vars _ [] = []
wenzelm@4285
   865
      | zip_vars (_ :: vs) (None :: opt_ts) = zip_vars vs opt_ts
wenzelm@4285
   866
      | zip_vars (v :: vs) (Some t :: opt_ts) = (v, t) :: zip_vars vs opt_ts
wenzelm@4285
   867
      | zip_vars [] _ = err "more instantiations than variables in thm";
wenzelm@4285
   868
wenzelm@4285
   869
    (*instantiate types first!*)
wenzelm@4285
   870
    val thm' =
wenzelm@4285
   871
      if forall is_none cTs then thm
wenzelm@4285
   872
      else Thm.instantiate (zip_vars (map fst (tvars_of thm)) cTs, []) thm;
wenzelm@4285
   873
    in
wenzelm@4285
   874
      if forall is_none cts then thm'
wenzelm@4285
   875
      else Thm.instantiate ([], map inst_of (zip_vars (vars_of thm') cts)) thm'
wenzelm@4285
   876
    end;
wenzelm@4285
   877
wenzelm@4285
   878
wenzelm@5688
   879
(* unvarify(T) *)
wenzelm@5688
   880
wenzelm@5688
   881
(*assume thm in standard form, i.e. no frees, 0 var indexes*)
wenzelm@5688
   882
wenzelm@5688
   883
fun unvarifyT thm =
wenzelm@5688
   884
  let
wenzelm@5688
   885
    val cT = Thm.ctyp_of (Thm.sign_of_thm thm);
wenzelm@5688
   886
    val tfrees = map (fn ((x, _), S) => Some (cT (TFree (x, S)))) (tvars_of thm);
wenzelm@5688
   887
  in instantiate' tfrees [] thm end;
wenzelm@5688
   888
wenzelm@5688
   889
fun unvarify raw_thm =
wenzelm@5688
   890
  let
wenzelm@5688
   891
    val thm = unvarifyT raw_thm;
wenzelm@5688
   892
    val ct = Thm.cterm_of (Thm.sign_of_thm thm);
wenzelm@5688
   893
    val frees = map (fn ((x, _), T) => Some (ct (Free (x, T)))) (vars_of thm);
wenzelm@5688
   894
  in instantiate' [] frees thm end;
wenzelm@5688
   895
wenzelm@5688
   896
wenzelm@8605
   897
(* tvars_intr_list *)
wenzelm@8605
   898
wenzelm@8605
   899
fun tfrees_of thm =
wenzelm@8605
   900
  let val {hyps, prop, ...} = Thm.rep_thm thm
wenzelm@8605
   901
  in foldr Term.add_term_tfree_names (prop :: hyps, []) end;
wenzelm@8605
   902
wenzelm@8605
   903
fun tvars_intr_list tfrees thm =
wenzelm@8605
   904
  Thm.varifyT' (tfrees_of thm \\ tfrees) thm;
wenzelm@8605
   905
wenzelm@8605
   906
wenzelm@6435
   907
(* increment var indexes *)
wenzelm@6435
   908
wenzelm@6435
   909
fun incr_indexes_wrt is cTs cts thms =
wenzelm@6435
   910
  let
wenzelm@6435
   911
    val maxidx =
wenzelm@6435
   912
      foldl Int.max (~1, is @
wenzelm@6435
   913
        map (maxidx_of_typ o #T o Thm.rep_ctyp) cTs @
wenzelm@6435
   914
        map (#maxidx o Thm.rep_cterm) cts @
wenzelm@6435
   915
        map (#maxidx o Thm.rep_thm) thms);
berghofe@10414
   916
  in Thm.incr_indexes (maxidx + 1) end;
wenzelm@6435
   917
wenzelm@6435
   918
wenzelm@8328
   919
(* freeze_all *)
wenzelm@8328
   920
wenzelm@8328
   921
(*freeze all (T)Vars; assumes thm in standard form*)
wenzelm@8328
   922
wenzelm@8328
   923
fun freeze_all_TVars thm =
wenzelm@8328
   924
  (case tvars_of thm of
wenzelm@8328
   925
    [] => thm
wenzelm@8328
   926
  | tvars =>
wenzelm@8328
   927
      let val cert = Thm.ctyp_of (Thm.sign_of_thm thm)
wenzelm@8328
   928
      in instantiate' (map (fn ((x, _), S) => Some (cert (TFree (x, S)))) tvars) [] thm end);
wenzelm@8328
   929
wenzelm@8328
   930
fun freeze_all_Vars thm =
wenzelm@8328
   931
  (case vars_of thm of
wenzelm@8328
   932
    [] => thm
wenzelm@8328
   933
  | vars =>
wenzelm@8328
   934
      let val cert = Thm.cterm_of (Thm.sign_of_thm thm)
wenzelm@8328
   935
      in instantiate' [] (map (fn ((x, _), T) => Some (cert (Free (x, T)))) vars) thm end);
wenzelm@8328
   936
wenzelm@8328
   937
val freeze_all = freeze_all_Vars o freeze_all_TVars;
wenzelm@8328
   938
wenzelm@8328
   939
wenzelm@5688
   940
(* mk_triv_goal *)
wenzelm@5688
   941
wenzelm@5688
   942
(*make an initial proof state, "PROP A ==> (PROP A)" *)
paulson@5311
   943
fun mk_triv_goal ct = instantiate' [] [Some ct] triv_goal;
paulson@5311
   944
wenzelm@11975
   945
wenzelm@11975
   946
wenzelm@11975
   947
(** meta-level conjunction **)
wenzelm@11975
   948
wenzelm@11975
   949
local
wenzelm@11975
   950
  val A = read_prop "PROP A";
wenzelm@11975
   951
  val B = read_prop "PROP B";
wenzelm@11975
   952
  val C = read_prop "PROP C";
wenzelm@11975
   953
  val ABC = read_prop "PROP A ==> PROP B ==> PROP C";
wenzelm@11975
   954
wenzelm@11975
   955
  val proj1 =
wenzelm@11975
   956
    forall_intr_list [A, B] (implies_intr_list [A, B] (Thm.assume A))
wenzelm@11975
   957
    |> forall_elim_vars 0;
wenzelm@11975
   958
wenzelm@11975
   959
  val proj2 =
wenzelm@11975
   960
    forall_intr_list [A, B] (implies_intr_list [A, B] (Thm.assume B))
wenzelm@11975
   961
    |> forall_elim_vars 0;
wenzelm@11975
   962
wenzelm@11975
   963
  val conj_intr_rule =
wenzelm@11975
   964
    forall_intr_list [A, B] (implies_intr_list [A, B]
wenzelm@11975
   965
      (Thm.forall_intr C (Thm.implies_intr ABC
wenzelm@11975
   966
        (implies_elim_list (Thm.assume ABC) [Thm.assume A, Thm.assume B]))))
wenzelm@11975
   967
    |> forall_elim_vars 0;
wenzelm@11975
   968
wenzelm@11975
   969
  val incr = incr_indexes_wrt [] [] [];
wenzelm@11975
   970
in
wenzelm@11975
   971
wenzelm@11975
   972
fun conj_intr tha thb = thb COMP (tha COMP incr [tha, thb] conj_intr_rule);
wenzelm@12756
   973
wenzelm@12756
   974
fun conj_intr_list [] = asm_rl
wenzelm@12756
   975
  | conj_intr_list ths = foldr1 (uncurry conj_intr) ths;
wenzelm@11975
   976
wenzelm@11975
   977
fun conj_elim th =
wenzelm@11975
   978
  let val th' = forall_elim_var (#maxidx (Thm.rep_thm th) + 1) th
wenzelm@11975
   979
  in (incr [th'] proj1 COMP th', incr [th'] proj2 COMP th') end;
wenzelm@11975
   980
wenzelm@11975
   981
fun conj_elim_list th =
wenzelm@11975
   982
  let val (th1, th2) = conj_elim th
wenzelm@11975
   983
  in conj_elim_list th1 @ conj_elim_list th2 end handle THM _ => [th];
wenzelm@11975
   984
wenzelm@12756
   985
fun conj_elim_precise 0 _ = []
wenzelm@12756
   986
  | conj_elim_precise 1 th = [th]
wenzelm@12135
   987
  | conj_elim_precise n th =
wenzelm@12135
   988
      let val (th1, th2) = conj_elim th
wenzelm@12135
   989
      in th1 :: conj_elim_precise (n - 1) th2 end;
wenzelm@12135
   990
wenzelm@12135
   991
val conj_intr_thm = store_standard_thm_open "conjunctionI"
wenzelm@12135
   992
  (implies_intr_list [A, B] (conj_intr (Thm.assume A) (Thm.assume B)));
wenzelm@12135
   993
clasohm@0
   994
end;
wenzelm@252
   995
wenzelm@11975
   996
end;
wenzelm@5903
   997
wenzelm@5903
   998
structure BasicDrule: BASIC_DRULE = Drule;
wenzelm@5903
   999
open BasicDrule;