src/HOL/Tools/lin_arith.ML
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(*  Title:      HOL/Tools/lin_arith.ML
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    Author:     Tjark Weber and Tobias Nipkow, TU Muenchen
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HOL setup for linear arithmetic (see Provers/Arith/fast_lin_arith.ML).
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*)
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signature LIN_ARITH =
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sig
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  val pre_tac: simpset -> int -> tactic
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  val simple_tac: Proof.context -> int -> tactic
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  val tac: Proof.context -> int -> tactic
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  val simproc: simpset -> term -> thm option
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  val add_inj_thms: thm list -> Context.generic -> Context.generic
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  val add_lessD: thm -> Context.generic -> Context.generic
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  val add_simps: thm list -> Context.generic -> Context.generic
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  val add_simprocs: simproc list -> Context.generic -> Context.generic
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  val add_inj_const: string * typ -> Context.generic -> Context.generic
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  val add_discrete_type: string -> Context.generic -> Context.generic
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  val set_number_of: (theory -> typ -> int -> cterm) -> Context.generic -> Context.generic
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  val setup: Context.generic -> Context.generic
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  val global_setup: theory -> theory
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  val split_limit: int Config.T
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  val neq_limit: int Config.T
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  val trace: bool Unsynchronized.ref
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end;
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structure Lin_Arith: LIN_ARITH =
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struct
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(* Parameters data for general linear arithmetic functor *)
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structure LA_Logic: LIN_ARITH_LOGIC =
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struct
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val ccontr = ccontr;
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val conjI = conjI;
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val notI = notI;
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val sym = sym;
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val trueI = TrueI;
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val not_lessD = @{thm linorder_not_less} RS iffD1;
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val not_leD = @{thm linorder_not_le} RS iffD1;
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fun mk_Eq thm = thm RS @{thm Eq_FalseI} handle THM _ => thm RS @{thm Eq_TrueI};
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val mk_Trueprop = HOLogic.mk_Trueprop;
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fun atomize thm = case Thm.prop_of thm of
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    Const (@{const_name Trueprop}, _) $ (Const (@{const_name HOL.conj}, _) $ _ $ _) =>
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    atomize (thm RS conjunct1) @ atomize (thm RS conjunct2)
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  | _ => [thm];
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fun neg_prop ((TP as Const(@{const_name Trueprop}, _)) $ (Const (@{const_name Not}, _) $ t)) = TP $ t
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  | neg_prop ((TP as Const(@{const_name Trueprop}, _)) $ t) = TP $ (HOLogic.Not $t)
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  | neg_prop t = raise TERM ("neg_prop", [t]);
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fun is_False thm =
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  let val _ $ t = Thm.prop_of thm
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  in t = HOLogic.false_const end;
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fun is_nat t = (fastype_of1 t = HOLogic.natT);
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fun mk_nat_thm thy t =
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  let
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    val cn = cterm_of thy (Var (("n", 0), HOLogic.natT))
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    and ct = cterm_of thy t
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  in instantiate ([], [(cn, ct)]) @{thm le0} end;
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end;  (* LA_Logic *)
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(* arith context data *)
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structure Lin_Arith_Data = Generic_Data
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(
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  type T = {splits: thm list,
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            inj_consts: (string * typ) list,
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            discrete: string list};
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  val empty = {splits = [], inj_consts = [], discrete = []};
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  val extend = I;
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  fun merge
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   ({splits= splits1, inj_consts= inj_consts1, discrete= discrete1},
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    {splits= splits2, inj_consts= inj_consts2, discrete= discrete2}) : T =
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   {splits = Thm.merge_thms (splits1, splits2),
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    inj_consts = Library.merge (op =) (inj_consts1, inj_consts2),
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    discrete = Library.merge (op =) (discrete1, discrete2)};
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);
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val get_arith_data = Lin_Arith_Data.get o Context.Proof;
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fun add_split thm = Lin_Arith_Data.map (fn {splits, inj_consts, discrete} =>
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  {splits = update Thm.eq_thm_prop thm splits,
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   inj_consts = inj_consts, discrete = discrete});
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fun add_discrete_type d = Lin_Arith_Data.map (fn {splits, inj_consts, discrete} =>
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  {splits = splits, inj_consts = inj_consts,
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   discrete = update (op =) d discrete});
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fun add_inj_const c = Lin_Arith_Data.map (fn {splits, inj_consts, discrete} =>
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  {splits = splits, inj_consts = update (op =) c inj_consts,
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   discrete = discrete});
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val (split_limit, setup_split_limit) = Attrib.config_int "linarith_split_limit" (K 9);
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val (neq_limit, setup_neq_limit) = Attrib.config_int "linarith_neq_limit" (K 9);
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structure LA_Data =
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struct
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val fast_arith_neq_limit = neq_limit;
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(* Decomposition of terms *)
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(*internal representation of linear (in-)equations*)
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type decomp =
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  ((term * Rat.rat) list * Rat.rat * string * (term * Rat.rat) list * Rat.rat * bool);
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fun nT (Type ("fun", [N, _])) = (N = HOLogic.natT)
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  | nT _                      = false;
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fun add_atom (t : term) (m : Rat.rat) (p : (term * Rat.rat) list, i : Rat.rat) :
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             (term * Rat.rat) list * Rat.rat =
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  case AList.lookup Pattern.aeconv p t of
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      NONE   => ((t, m) :: p, i)
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    | SOME n => (AList.update Pattern.aeconv (t, Rat.add n m) p, i);
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(* decompose nested multiplications, bracketing them to the right and combining
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   all their coefficients
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   inj_consts: list of constants to be ignored when encountered
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               (e.g. arithmetic type conversions that preserve value)
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   m: multiplicity associated with the entire product
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   returns either (SOME term, associated multiplicity) or (NONE, constant)
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*)
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fun demult (inj_consts : (string * typ) list) : term * Rat.rat -> term option * Rat.rat =
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let
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  fun demult ((mC as Const (@{const_name Groups.times}, _)) $ s $ t, m) =
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      (case s of Const (@{const_name Groups.times}, _) $ s1 $ s2 =>
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        (* bracketing to the right: '(s1 * s2) * t' becomes 's1 * (s2 * t)' *)
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        demult (mC $ s1 $ (mC $ s2 $ t), m)
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      | _ =>
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        (* product 's * t', where either factor can be 'NONE' *)
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        (case demult (s, m) of
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          (SOME s', m') =>
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            (case demult (t, m') of
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              (SOME t', m'') => (SOME (mC $ s' $ t'), m'')
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            | (NONE,    m'') => (SOME s', m''))
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        | (NONE,    m') => demult (t, m')))
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    | demult ((mC as Const (@{const_name Rings.divide}, _)) $ s $ t, m) =
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      (* FIXME: Shouldn't we simplify nested quotients, e.g. '(s/t)/u' could
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         become 's/(t*u)', and '(s*t)/u' could become 's*(t/u)' ?   Note that
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         if we choose to do so here, the simpset used by arith must be able to
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         perform the same simplifications. *)
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      (* FIXME: Currently we treat the numerator as atomic unless the
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         denominator can be reduced to a numeric constant.  It might be better
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         to demult the numerator in any case, and invent a new term of the form
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         '1 / t' if the numerator can be reduced, but the denominator cannot. *)
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      (* FIXME: Currently we even treat the whole fraction as atomic unless the
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         denominator can be reduced to a numeric constant.  It might be better
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         to use the partially reduced denominator (i.e. 's / (2*t)' could be
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         demult'ed to 's / t' with multiplicity .5).   This would require a
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         very simple change only below, but it breaks existing proofs. *)
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      (* quotient 's / t', where the denominator t can be NONE *)
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      (* Note: will raise Rat.DIVZERO iff m' is Rat.zero *)
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      (case demult (t, Rat.one) of
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        (SOME _, _) => (SOME (mC $ s $ t), m)
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      | (NONE,  m') => apsnd (Rat.mult (Rat.inv m')) (demult (s, m)))
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    (* terms that evaluate to numeric constants *)
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    | demult (Const (@{const_name Groups.uminus}, _) $ t, m) = demult (t, Rat.neg m)
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    | demult (Const (@{const_name Groups.zero}, _), m) = (NONE, Rat.zero)
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    | demult (Const (@{const_name Groups.one}, _), m) = (NONE, m)
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    (*Warning: in rare cases number_of encloses a non-numeral,
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      in which case dest_numeral raises TERM; hence all the handles below.
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      Same for Suc-terms that turn out not to be numerals -
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      although the simplifier should eliminate those anyway ...*)
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    | demult (t as Const ("Int.number_class.number_of", _) $ n, m) =
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      ((NONE, Rat.mult m (Rat.rat_of_int (HOLogic.dest_numeral n)))
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        handle TERM _ => (SOME t, m))
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    | demult (t as Const (@{const_name Suc}, _) $ _, m) =
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      ((NONE, Rat.mult m (Rat.rat_of_int (HOLogic.dest_nat t)))
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        handle TERM _ => (SOME t, m))
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    (* injection constants are ignored *)
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    | demult (t as Const f $ x, m) =
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      if member (op =) inj_consts f then demult (x, m) else (SOME t, m)
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    (* everything else is considered atomic *)
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    | demult (atom, m) = (SOME atom, m)
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in demult end;
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fun decomp0 (inj_consts : (string * typ) list) (rel : string, lhs : term, rhs : term) :
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            ((term * Rat.rat) list * Rat.rat * string * (term * Rat.rat) list * Rat.rat) option =
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let
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  (* Turns a term 'all' and associated multiplicity 'm' into a list 'p' of
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     summands and associated multiplicities, plus a constant 'i' (with implicit
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     multiplicity 1) *)
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  fun poly (Const (@{const_name Groups.plus}, _) $ s $ t,
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        m : Rat.rat, pi : (term * Rat.rat) list * Rat.rat) = poly (s, m, poly (t, m, pi))
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    | poly (all as Const (@{const_name Groups.minus}, T) $ s $ t, m, pi) =
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        if nT T then add_atom all m pi else poly (s, m, poly (t, Rat.neg m, pi))
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    | poly (all as Const (@{const_name Groups.uminus}, T) $ t, m, pi) =
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        if nT T then add_atom all m pi else poly (t, Rat.neg m, pi)
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    | poly (Const (@{const_name Groups.zero}, _), _, pi) =
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        pi
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    | poly (Const (@{const_name Groups.one}, _), m, (p, i)) =
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        (p, Rat.add i m)
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    | poly (Const (@{const_name Suc}, _) $ t, m, (p, i)) =
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        poly (t, m, (p, Rat.add i m))
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    | poly (all as Const (@{const_name Groups.times}, _) $ _ $ _, m, pi as (p, i)) =
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        (case demult inj_consts (all, m) of
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           (NONE,   m') => (p, Rat.add i m')
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         | (SOME u, m') => add_atom u m' pi)
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    | poly (all as Const (@{const_name Rings.divide}, _) $ _ $ _, m, pi as (p, i)) =
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        (case demult inj_consts (all, m) of
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           (NONE,   m') => (p, Rat.add i m')
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         | (SOME u, m') => add_atom u m' pi)
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    | poly (all as Const ("Int.number_class.number_of", Type(_,[_,T])) $ t, m, pi as (p, i)) =
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        (let val k = HOLogic.dest_numeral t
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            val k2 = if k < 0 andalso T = HOLogic.natT then 0 else k
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        in (p, Rat.add i (Rat.mult m (Rat.rat_of_int k2))) end
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        handle TERM _ => add_atom all m pi)
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    | poly (all as Const f $ x, m, pi) =
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        if member (op =) inj_consts f then poly (x, m, pi) else add_atom all m pi
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    | poly (all, m, pi) =
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        add_atom all m pi
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  val (p, i) = poly (lhs, Rat.one, ([], Rat.zero))
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  val (q, j) = poly (rhs, Rat.one, ([], Rat.zero))
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in
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  case rel of
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    @{const_name Orderings.less}    => SOME (p, i, "<", q, j)
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  | @{const_name Orderings.less_eq} => SOME (p, i, "<=", q, j)
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  | @{const_name HOL.eq}            => SOME (p, i, "=", q, j)
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  | _                   => NONE
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end handle Rat.DIVZERO => NONE;
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fun of_lin_arith_sort thy U =
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  Sign.of_sort thy (U, @{sort Rings.linordered_idom});
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31101
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fun allows_lin_arith thy (discrete : string list) (U as Type (D, [])) : bool * bool =
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      if of_lin_arith_sort thy U then (true, member (op =) discrete D)
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      else if member (op =) discrete D then (true, true) else (false, false)
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  | allows_lin_arith sg discrete U = (of_lin_arith_sort sg U, false);
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fun decomp_typecheck (thy, discrete, inj_consts) (T : typ, xxx) : decomp option =
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  case T of
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    Type ("fun", [U, _]) =>
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      (case allows_lin_arith thy discrete U of
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        (true, d) =>
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          (case decomp0 inj_consts xxx of
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            NONE                   => NONE
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          | SOME (p, i, rel, q, j) => SOME (p, i, rel, q, j, d))
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      | (false, _) =>
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          NONE)
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  | _ => NONE;
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fun negate (SOME (x, i, rel, y, j, d)) = SOME (x, i, "~" ^ rel, y, j, d)
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  | negate NONE                        = NONE;
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fun decomp_negation data
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  ((Const (@{const_name Trueprop}, _)) $ (Const (rel, T) $ lhs $ rhs)) : decomp option =
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      decomp_typecheck data (T, (rel, lhs, rhs))
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  | decomp_negation data ((Const (@{const_name Trueprop}, _)) $
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  (Const (@{const_name Not}, _) $ (Const (rel, T) $ lhs $ rhs))) =
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      negate (decomp_typecheck data (T, (rel, lhs, rhs)))
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  | decomp_negation data _ =
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      NONE;
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fun decomp ctxt : term -> decomp option =
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  let
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    val thy = Proof_Context.theory_of ctxt
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    val {discrete, inj_consts, ...} = get_arith_data ctxt
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  in decomp_negation (thy, discrete, inj_consts) end;
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fun domain_is_nat (_ $ (Const (_, T) $ _ $ _)) = nT T
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  | domain_is_nat (_ $ (Const (@{const_name Not}, _) $ (Const (_, T) $ _ $ _))) = nT T
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  | domain_is_nat _ = false;
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(*---------------------------------------------------------------------------*)
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(* the following code performs splitting of certain constants (e.g., min,    *)
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(* max) in a linear arithmetic problem; similar to what split_tac later does *)
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(* to the proof state                                                        *)
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(*---------------------------------------------------------------------------*)
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(* checks if splitting with 'thm' is implemented                             *)
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fun is_split_thm ctxt thm =
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  (case concl_of thm of _ $ (_ $ (_ $ lhs) $ _) =>
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    (* Trueprop $ ((op =) $ (?P $ lhs) $ rhs) *)
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    (case head_of lhs of
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      Const (a, _) =>
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        member (op =)
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         [@{const_name Orderings.max},
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          @{const_name Orderings.min},
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          @{const_name Groups.abs},
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          @{const_name Groups.minus},
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          "Int.nat" (*DYNAMIC BINDING!*),
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          "Divides.div_class.mod" (*DYNAMIC BINDING!*),
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          "Divides.div_class.div" (*DYNAMIC BINDING!*)] a
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    | _ =>
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      (warning ("Lin. Arith.: wrong format for split rule " ^ Display.string_of_thm ctxt thm);
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        false))
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  | _ =>
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    (warning ("Lin. Arith.: wrong format for split rule " ^ Display.string_of_thm ctxt thm);
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      false));
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(* substitute new for occurrences of old in a term, incrementing bound       *)
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(* variables as needed when substituting inside an abstraction               *)
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fun subst_term ([] : (term * term) list) (t : term) = t
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  | subst_term pairs                     t          =
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      (case AList.lookup Pattern.aeconv pairs t of
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        SOME new =>
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          new
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      | NONE     =>
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          (case t of Abs (a, T, body) =>
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            let val pairs' = map (pairself (incr_boundvars 1)) pairs
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            in  Abs (a, T, subst_term pairs' body)  end
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          | t1 $ t2                   =>
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            subst_term pairs t1 $ subst_term pairs t2
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          | _ => t));
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(* approximates the effect of one application of split_tac (followed by NNF  *)
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(* normalization) on the subgoal represented by '(Ts, terms)'; returns a     *)
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(* list of new subgoals (each again represented by a typ list for bound      *)
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(* variables and a term list for premises), or NONE if split_tac would fail  *)
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(* on the subgoal                                                            *)
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(* FIXME: currently only the effect of certain split theorems is reproduced  *)
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(*        (which is why we need 'is_split_thm').  A more canonical           *)
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(*        implementation should analyze the right-hand side of the split     *)
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(*        theorem that can be applied, and modify the subgoal accordingly.   *)
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(*        Or even better, the splitter should be extended to provide         *)
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(*        splitting on terms as well as splitting on theorems (where the     *)
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(*        former can have a faster implementation as it does not need to be  *)
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(*        proof-producing).                                                  *)
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fun split_once_items ctxt (Ts : typ list, terms : term list) :
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                     (typ list * term list) list option =
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let
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  val thy = Proof_Context.theory_of ctxt
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  (* takes a list  [t1, ..., tn]  to the term                                *)
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  (*   tn' --> ... --> t1' --> False  ,                                      *)
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  (* where ti' = HOLogic.dest_Trueprop ti                                    *)
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  fun REPEAT_DETERM_etac_rev_mp tms =
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    fold (curry HOLogic.mk_imp) (map HOLogic.dest_Trueprop tms)
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      HOLogic.false_const
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  val split_thms  = filter (is_split_thm ctxt) (#splits (get_arith_data ctxt))
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  val cmap        = Splitter.cmap_of_split_thms split_thms
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  val goal_tm     = REPEAT_DETERM_etac_rev_mp terms
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  val splits      = Splitter.split_posns cmap thy Ts goal_tm
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  val split_limit = Config.get ctxt split_limit
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in
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  if length splits > split_limit then (
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    tracing ("linarith_split_limit exceeded (current value is " ^
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      string_of_int split_limit ^ ")");
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    NONE
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  ) else case splits of
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    [] =>
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    (* split_tac would fail: no possible split *)
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    NONE
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  | (_, _::_, _, _, _) :: _ =>
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    (* disallow a split that involves non-locally bound variables (except    *)
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    (* when bound by outermost meta-quantifiers)                             *)
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    NONE
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  | (_, [], _, split_type, split_term) :: _ =>
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    (* ignore all but the first possible split                               *)
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    (case strip_comb split_term of
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    (* ?P (max ?i ?j) = ((?i <= ?j --> ?P ?j) & (~ ?i <= ?j --> ?P ?i)) *)
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      (Const (@{const_name Orderings.max}, _), [t1, t2]) =>
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      let
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        val rev_terms     = rev terms
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        val terms1        = map (subst_term [(split_term, t1)]) rev_terms
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        val terms2        = map (subst_term [(split_term, t2)]) rev_terms
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        val t1_leq_t2     = Const (@{const_name Orderings.less_eq},
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                                    split_type --> split_type --> HOLogic.boolT) $ t1 $ t2
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        val not_t1_leq_t2 = HOLogic.Not $ t1_leq_t2
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        val not_false     = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
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        val subgoal1      = (HOLogic.mk_Trueprop t1_leq_t2) :: terms2 @ [not_false]
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        val subgoal2      = (HOLogic.mk_Trueprop not_t1_leq_t2) :: terms1 @ [not_false]
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      in
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        SOME [(Ts, subgoal1), (Ts, subgoal2)]
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      end
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    (* ?P (min ?i ?j) = ((?i <= ?j --> ?P ?i) & (~ ?i <= ?j --> ?P ?j)) *)
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    | (Const (@{const_name Orderings.min}, _), [t1, t2]) =>
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      let
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        val rev_terms     = rev terms
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        val terms1        = map (subst_term [(split_term, t1)]) rev_terms
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        val terms2        = map (subst_term [(split_term, t2)]) rev_terms
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        val t1_leq_t2     = Const (@{const_name Orderings.less_eq},
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                                    split_type --> split_type --> HOLogic.boolT) $ t1 $ t2
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        val not_t1_leq_t2 = HOLogic.Not $ t1_leq_t2
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   393
        val not_false     = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   394
        val subgoal1      = (HOLogic.mk_Trueprop t1_leq_t2) :: terms1 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   395
        val subgoal2      = (HOLogic.mk_Trueprop not_t1_leq_t2) :: terms2 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   396
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   397
        SOME [(Ts, subgoal1), (Ts, subgoal2)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   398
      end
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   399
    (* ?P (abs ?a) = ((0 <= ?a --> ?P ?a) & (?a < 0 --> ?P (- ?a))) *)
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   400
    | (Const (@{const_name Groups.abs}, _), [t1]) =>
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   401
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   402
        val rev_terms   = rev terms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   403
        val terms1      = map (subst_term [(split_term, t1)]) rev_terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   404
        val terms2      = map (subst_term [(split_term, Const (@{const_name Groups.uminus},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   405
                            split_type --> split_type) $ t1)]) rev_terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   406
        val zero        = Const (@{const_name Groups.zero}, split_type)
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   407
        val zero_leq_t1 = Const (@{const_name Orderings.less_eq},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   408
                            split_type --> split_type --> HOLogic.boolT) $ zero $ t1
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   409
        val t1_lt_zero  = Const (@{const_name Orderings.less},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   410
                            split_type --> split_type --> HOLogic.boolT) $ t1 $ zero
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   411
        val not_false   = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   412
        val subgoal1    = (HOLogic.mk_Trueprop zero_leq_t1) :: terms1 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   413
        val subgoal2    = (HOLogic.mk_Trueprop t1_lt_zero) :: terms2 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   414
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   415
        SOME [(Ts, subgoal1), (Ts, subgoal2)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   416
      end
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   417
    (* ?P (?a - ?b) = ((?a < ?b --> ?P 0) & (ALL d. ?a = ?b + d --> ?P d)) *)
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   418
    | (Const (@{const_name Groups.minus}, _), [t1, t2]) =>
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   419
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   420
        (* "d" in the above theorem becomes a new bound variable after NNF   *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   421
        (* transformation, therefore some adjustment of indices is necessary *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   422
        val rev_terms       = rev terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   423
        val zero            = Const (@{const_name Groups.zero}, split_type)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   424
        val d               = Bound 0
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   425
        val terms1          = map (subst_term [(split_term, zero)]) rev_terms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   426
        val terms2          = map (subst_term [(incr_boundvars 1 split_term, d)])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   427
                                (map (incr_boundvars 1) rev_terms)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   428
        val t1'             = incr_boundvars 1 t1
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   429
        val t2'             = incr_boundvars 1 t2
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   430
        val t1_lt_t2        = Const (@{const_name Orderings.less},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   431
                                split_type --> split_type --> HOLogic.boolT) $ t1 $ t2
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   432
        val t1_eq_t2_plus_d = Const (@{const_name HOL.eq}, split_type --> split_type --> HOLogic.boolT) $ t1' $
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   433
                                (Const (@{const_name Groups.plus},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   434
                                  split_type --> split_type --> split_type) $ t2' $ d)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   435
        val not_false       = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   436
        val subgoal1        = (HOLogic.mk_Trueprop t1_lt_t2) :: terms1 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   437
        val subgoal2        = (HOLogic.mk_Trueprop t1_eq_t2_plus_d) :: terms2 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   438
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   439
        SOME [(Ts, subgoal1), (split_type :: Ts, subgoal2)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   440
      end
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   441
    (* ?P (nat ?i) = ((ALL n. ?i = of_nat n --> ?P n) & (?i < 0 --> ?P 0)) *)
25919
8b1c0d434824 joined theories IntDef, Numeral, IntArith to theory Int
haftmann
parents: 25015
diff changeset
   442
    | (Const ("Int.nat", _), [t1]) =>
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   443
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   444
        val rev_terms   = rev terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   445
        val zero_int    = Const (@{const_name Groups.zero}, HOLogic.intT)
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   446
        val zero_nat    = Const (@{const_name Groups.zero}, HOLogic.natT)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   447
        val n           = Bound 0
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   448
        val terms1      = map (subst_term [(incr_boundvars 1 split_term, n)])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   449
                            (map (incr_boundvars 1) rev_terms)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   450
        val terms2      = map (subst_term [(split_term, zero_nat)]) rev_terms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   451
        val t1'         = incr_boundvars 1 t1
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   452
        val t1_eq_nat_n = Const (@{const_name HOL.eq}, HOLogic.intT --> HOLogic.intT --> HOLogic.boolT) $ t1' $
24196
f1dbfd7e3223 localized of_nat
haftmann
parents: 24112
diff changeset
   453
                            (Const (@{const_name of_nat}, HOLogic.natT --> HOLogic.intT) $ n)
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   454
        val t1_lt_zero  = Const (@{const_name Orderings.less},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   455
                            HOLogic.intT --> HOLogic.intT --> HOLogic.boolT) $ t1 $ zero_int
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   456
        val not_false   = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   457
        val subgoal1    = (HOLogic.mk_Trueprop t1_eq_nat_n) :: terms1 @ [not_false]
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   458
        val subgoal2    = (HOLogic.mk_Trueprop t1_lt_zero) :: terms2 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   459
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   460
        SOME [(HOLogic.natT :: Ts, subgoal1), (Ts, subgoal2)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   461
      end
33719
474ebcc348e6 Fixed a typo in a comment.
webertj
parents: 33554
diff changeset
   462
    (* ?P ((?n::nat) mod (number_of ?k)) =
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   463
         ((number_of ?k = 0 --> ?P ?n) & (~ (number_of ?k = 0) -->
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   464
           (ALL i j. j < number_of ?k --> ?n = number_of ?k * i + j --> ?P j))) *)
37388
793618618f78 tuned quotes, antiquotations and whitespace
haftmann
parents: 36692
diff changeset
   465
    | (Const ("Divides.div_class.mod", Type ("fun", [@{typ nat}, _])), [t1, t2]) =>
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   466
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   467
        val rev_terms               = rev terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   468
        val zero                    = Const (@{const_name Groups.zero}, split_type)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   469
        val i                       = Bound 1
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   470
        val j                       = Bound 0
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   471
        val terms1                  = map (subst_term [(split_term, t1)]) rev_terms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   472
        val terms2                  = map (subst_term [(incr_boundvars 2 split_term, j)])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   473
                                        (map (incr_boundvars 2) rev_terms)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   474
        val t1'                     = incr_boundvars 2 t1
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   475
        val t2'                     = incr_boundvars 2 t2
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   476
        val t2_eq_zero              = Const (@{const_name HOL.eq},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   477
                                        split_type --> split_type --> HOLogic.boolT) $ t2 $ zero
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   478
        val t2_neq_zero             = HOLogic.mk_not (Const (@{const_name HOL.eq},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   479
                                        split_type --> split_type --> HOLogic.boolT) $ t2' $ zero)
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   480
        val j_lt_t2                 = Const (@{const_name Orderings.less},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   481
                                        split_type --> split_type--> HOLogic.boolT) $ j $ t2'
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   482
        val t1_eq_t2_times_i_plus_j = Const (@{const_name HOL.eq}, split_type --> split_type --> HOLogic.boolT) $ t1' $
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   483
                                       (Const (@{const_name Groups.plus}, split_type --> split_type --> split_type) $
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   484
                                         (Const (@{const_name Groups.times},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   485
                                           split_type --> split_type --> split_type) $ t2' $ i) $ j)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   486
        val not_false               = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   487
        val subgoal1                = (HOLogic.mk_Trueprop t2_eq_zero) :: terms1 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   488
        val subgoal2                = (map HOLogic.mk_Trueprop
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   489
                                        [t2_neq_zero, j_lt_t2, t1_eq_t2_times_i_plus_j])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   490
                                          @ terms2 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   491
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   492
        SOME [(Ts, subgoal1), (split_type :: split_type :: Ts, subgoal2)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   493
      end
33719
474ebcc348e6 Fixed a typo in a comment.
webertj
parents: 33554
diff changeset
   494
    (* ?P ((?n::nat) div (number_of ?k)) =
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   495
         ((number_of ?k = 0 --> ?P 0) & (~ (number_of ?k = 0) -->
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   496
           (ALL i j. j < number_of ?k --> ?n = number_of ?k * i + j --> ?P i))) *)
37388
793618618f78 tuned quotes, antiquotations and whitespace
haftmann
parents: 36692
diff changeset
   497
    | (Const ("Divides.div_class.div", Type ("fun", [@{typ nat}, _])), [t1, t2]) =>
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   498
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   499
        val rev_terms               = rev terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   500
        val zero                    = Const (@{const_name Groups.zero}, split_type)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   501
        val i                       = Bound 1
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   502
        val j                       = Bound 0
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   503
        val terms1                  = map (subst_term [(split_term, zero)]) rev_terms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   504
        val terms2                  = map (subst_term [(incr_boundvars 2 split_term, i)])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   505
                                        (map (incr_boundvars 2) rev_terms)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   506
        val t1'                     = incr_boundvars 2 t1
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   507
        val t2'                     = incr_boundvars 2 t2
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   508
        val t2_eq_zero              = Const (@{const_name HOL.eq},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   509
                                        split_type --> split_type --> HOLogic.boolT) $ t2 $ zero
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   510
        val t2_neq_zero             = HOLogic.mk_not (Const (@{const_name HOL.eq},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   511
                                        split_type --> split_type --> HOLogic.boolT) $ t2' $ zero)
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   512
        val j_lt_t2                 = Const (@{const_name Orderings.less},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   513
                                        split_type --> split_type--> HOLogic.boolT) $ j $ t2'
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   514
        val t1_eq_t2_times_i_plus_j = Const (@{const_name HOL.eq}, split_type --> split_type --> HOLogic.boolT) $ t1' $
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   515
                                       (Const (@{const_name Groups.plus}, split_type --> split_type --> split_type) $
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   516
                                         (Const (@{const_name Groups.times},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   517
                                           split_type --> split_type --> split_type) $ t2' $ i) $ j)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   518
        val not_false               = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   519
        val subgoal1                = (HOLogic.mk_Trueprop t2_eq_zero) :: terms1 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   520
        val subgoal2                = (map HOLogic.mk_Trueprop
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   521
                                        [t2_neq_zero, j_lt_t2, t1_eq_t2_times_i_plus_j])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   522
                                          @ terms2 @ [not_false]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   523
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   524
        SOME [(Ts, subgoal1), (split_type :: split_type :: Ts, subgoal2)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   525
      end
33719
474ebcc348e6 Fixed a typo in a comment.
webertj
parents: 33554
diff changeset
   526
    (* ?P ((?n::int) mod (number_of ?k)) =
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   527
         ((number_of ?k = 0 --> ?P ?n) &
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   528
          (0 < number_of ?k -->
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   529
            (ALL i j.
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   530
              0 <= j & j < number_of ?k & ?n = number_of ?k * i + j --> ?P j)) &
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   531
          (number_of ?k < 0 -->
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   532
            (ALL i j.
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   533
              number_of ?k < j & j <= 0 & ?n = number_of ?k * i + j --> ?P j))) *)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   534
    | (Const ("Divides.div_class.mod",
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   535
        Type ("fun", [Type ("Int.int", []), _])), [t1, t2]) =>
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   536
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   537
        val rev_terms               = rev terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   538
        val zero                    = Const (@{const_name Groups.zero}, split_type)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   539
        val i                       = Bound 1
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   540
        val j                       = Bound 0
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   541
        val terms1                  = map (subst_term [(split_term, t1)]) rev_terms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   542
        val terms2_3                = map (subst_term [(incr_boundvars 2 split_term, j)])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   543
                                        (map (incr_boundvars 2) rev_terms)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   544
        val t1'                     = incr_boundvars 2 t1
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   545
        val t2'                     = incr_boundvars 2 t2
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   546
        val t2_eq_zero              = Const (@{const_name HOL.eq},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   547
                                        split_type --> split_type --> HOLogic.boolT) $ t2 $ zero
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   548
        val zero_lt_t2              = Const (@{const_name Orderings.less},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   549
                                        split_type --> split_type --> HOLogic.boolT) $ zero $ t2'
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   550
        val t2_lt_zero              = Const (@{const_name Orderings.less},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   551
                                        split_type --> split_type --> HOLogic.boolT) $ t2' $ zero
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   552
        val zero_leq_j              = Const (@{const_name Orderings.less_eq},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   553
                                        split_type --> split_type --> HOLogic.boolT) $ zero $ j
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   554
        val j_leq_zero              = Const (@{const_name Orderings.less_eq},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   555
                                        split_type --> split_type --> HOLogic.boolT) $ j $ zero
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   556
        val j_lt_t2                 = Const (@{const_name Orderings.less},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   557
                                        split_type --> split_type--> HOLogic.boolT) $ j $ t2'
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   558
        val t2_lt_j                 = Const (@{const_name Orderings.less},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   559
                                        split_type --> split_type--> HOLogic.boolT) $ t2' $ j
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   560
        val t1_eq_t2_times_i_plus_j = Const (@{const_name HOL.eq}, split_type --> split_type --> HOLogic.boolT) $ t1' $
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   561
                                       (Const (@{const_name Groups.plus}, split_type --> split_type --> split_type) $
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   562
                                         (Const (@{const_name Groups.times},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   563
                                           split_type --> split_type --> split_type) $ t2' $ i) $ j)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   564
        val not_false               = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   565
        val subgoal1                = (HOLogic.mk_Trueprop t2_eq_zero) :: terms1 @ [not_false]
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   566
        val subgoal2                = (map HOLogic.mk_Trueprop [zero_lt_t2, zero_leq_j])
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   567
                                        @ hd terms2_3
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   568
                                        :: (if tl terms2_3 = [] then [not_false] else [])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   569
                                        @ (map HOLogic.mk_Trueprop [j_lt_t2, t1_eq_t2_times_i_plus_j])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   570
                                        @ (if tl terms2_3 = [] then [] else tl terms2_3 @ [not_false])
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   571
        val subgoal3                = (map HOLogic.mk_Trueprop [t2_lt_zero, t2_lt_j])
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   572
                                        @ hd terms2_3
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   573
                                        :: (if tl terms2_3 = [] then [not_false] else [])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   574
                                        @ (map HOLogic.mk_Trueprop [j_leq_zero, t1_eq_t2_times_i_plus_j])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   575
                                        @ (if tl terms2_3 = [] then [] else tl terms2_3 @ [not_false])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   576
        val Ts'                     = split_type :: split_type :: Ts
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   577
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   578
        SOME [(Ts, subgoal1), (Ts', subgoal2), (Ts', subgoal3)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   579
      end
33719
474ebcc348e6 Fixed a typo in a comment.
webertj
parents: 33554
diff changeset
   580
    (* ?P ((?n::int) div (number_of ?k)) =
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   581
         ((number_of ?k = 0 --> ?P 0) &
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   582
          (0 < number_of ?k -->
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   583
            (ALL i j.
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   584
              0 <= j & j < number_of ?k & ?n = number_of ?k * i + j --> ?P i)) &
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   585
          (number_of ?k < 0 -->
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   586
            (ALL i j.
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   587
              number_of ?k < j & j <= 0 & ?n = number_of ?k * i + j --> ?P i))) *)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   588
    | (Const ("Divides.div_class.div",
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   589
        Type ("fun", [Type ("Int.int", []), _])), [t1, t2]) =>
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   590
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   591
        val rev_terms               = rev terms
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   592
        val zero                    = Const (@{const_name Groups.zero}, split_type)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   593
        val i                       = Bound 1
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   594
        val j                       = Bound 0
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   595
        val terms1                  = map (subst_term [(split_term, zero)]) rev_terms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   596
        val terms2_3                = map (subst_term [(incr_boundvars 2 split_term, i)])
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   597
                                        (map (incr_boundvars 2) rev_terms)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   598
        val t1'                     = incr_boundvars 2 t1
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   599
        val t2'                     = incr_boundvars 2 t2
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   600
        val t2_eq_zero              = Const (@{const_name HOL.eq},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   601
                                        split_type --> split_type --> HOLogic.boolT) $ t2 $ zero
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   602
        val zero_lt_t2              = Const (@{const_name Orderings.less},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   603
                                        split_type --> split_type --> HOLogic.boolT) $ zero $ t2'
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   604
        val t2_lt_zero              = Const (@{const_name Orderings.less},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   605
                                        split_type --> split_type --> HOLogic.boolT) $ t2' $ zero
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   606
        val zero_leq_j              = Const (@{const_name Orderings.less_eq},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   607
                                        split_type --> split_type --> HOLogic.boolT) $ zero $ j
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   608
        val j_leq_zero              = Const (@{const_name Orderings.less_eq},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   609
                                        split_type --> split_type --> HOLogic.boolT) $ j $ zero
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   610
        val j_lt_t2                 = Const (@{const_name Orderings.less},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   611
                                        split_type --> split_type--> HOLogic.boolT) $ j $ t2'
35092
cfe605c54e50 moved less_eq, less to Orderings.thy; moved abs, sgn to Groups.thy
haftmann
parents: 35084
diff changeset
   612
        val t2_lt_j                 = Const (@{const_name Orderings.less},
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   613
                                        split_type --> split_type--> HOLogic.boolT) $ t2' $ j
38864
4abe644fcea5 formerly unnamed infix equality now named HOL.eq
haftmann
parents: 38797
diff changeset
   614
        val t1_eq_t2_times_i_plus_j = Const (@{const_name HOL.eq}, split_type --> split_type --> HOLogic.boolT) $ t1' $
35267
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   615
                                       (Const (@{const_name Groups.plus}, split_type --> split_type --> split_type) $
8dfd816713c6 moved remaning class operations from Algebras.thy to Groups.thy
haftmann
parents: 35092
diff changeset
   616
                                         (Const (@{const_name Groups.times},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   617
                                           split_type --> split_type --> split_type) $ t2' $ i) $ j)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   618
        val not_false               = HOLogic.mk_Trueprop (HOLogic.Not $ HOLogic.false_const)
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   619
        val subgoal1                = (HOLogic.mk_Trueprop t2_eq_zero) :: terms1 @ [not_false]
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   620
        val subgoal2                = (map HOLogic.mk_Trueprop [zero_lt_t2, zero_leq_j])
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   621
                                        @ hd terms2_3
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   622
                                        :: (if tl terms2_3 = [] then [not_false] else [])
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   623
                                        @ (map HOLogic.mk_Trueprop [j_lt_t2, t1_eq_t2_times_i_plus_j])
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   624
                                        @ (if tl terms2_3 = [] then [] else tl terms2_3 @ [not_false])
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   625
        val subgoal3                = (map HOLogic.mk_Trueprop [t2_lt_zero, t2_lt_j])
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   626
                                        @ hd terms2_3
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   627
                                        :: (if tl terms2_3 = [] then [not_false] else [])
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   628
                                        @ (map HOLogic.mk_Trueprop [j_leq_zero, t1_eq_t2_times_i_plus_j])
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   629
                                        @ (if tl terms2_3 = [] then [] else tl terms2_3 @ [not_false])
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   630
        val Ts'                     = split_type :: split_type :: Ts
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   631
      in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   632
        SOME [(Ts, subgoal1), (Ts', subgoal2), (Ts', subgoal3)]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   633
      end
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   634
    (* this will only happen if a split theorem can be applied for which no  *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   635
    (* code exists above -- in which case either the split theorem should be *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   636
    (* implemented above, or 'is_split_thm' should be modified to filter it  *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   637
    (* out                                                                   *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   638
    | (t, ts) => (
24920
2a45e400fdad generic Syntax.pretty/string_of operations;
wenzelm
parents: 24328
diff changeset
   639
      warning ("Lin. Arith.: split rule for " ^ Syntax.string_of_term ctxt t ^
32369
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   640
        " (with " ^ string_of_int (length ts) ^
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   641
        " argument(s)) not implemented; proof reconstruction is likely to fail");
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   642
      NONE
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   643
    ))
32369
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   644
end;  (* split_once_items *)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   645
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   646
(* remove terms that do not satisfy 'p'; change the order of the remaining   *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   647
(* terms in the same way as filter_prems_tac does                            *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   648
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   649
fun filter_prems_tac_items (p : term -> bool) (terms : term list) : term list =
42439
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   650
  let
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   651
    fun filter_prems t (left, right) =
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   652
      if p t then (left, right @ [t]) else (left @ right, [])
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   653
    val (left, right) = fold filter_prems terms ([], [])
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   654
  in
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   655
    right @ left
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   656
  end;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   657
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   658
(* return true iff TRY (etac notE) THEN eq_assume_tac would succeed on a     *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   659
(* subgoal that has 'terms' as premises                                      *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   660
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   661
fun negated_term_occurs_positively (terms : term list) : bool =
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   662
  List.exists
38558
32ad17fe2b9c tuned quotes
haftmann
parents: 38549
diff changeset
   663
    (fn (Trueprop $ (Const (@{const_name Not}, _) $ t)) =>
32369
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   664
      member Pattern.aeconv terms (Trueprop $ t)
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   665
      | _ => false)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   666
    terms;
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   667
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   668
fun pre_decomp ctxt (Ts : typ list, terms : term list) : (typ list * term list) list =
42439
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   669
  let
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   670
    (* repeatedly split (including newly emerging subgoals) until no further   *)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   671
    (* splitting is possible                                                   *)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   672
    fun split_loop ([] : (typ list * term list) list) = ([] : (typ list * term list) list)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   673
      | split_loop (subgoal::subgoals) =
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   674
          (case split_once_items ctxt subgoal of
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   675
            SOME new_subgoals => split_loop (new_subgoals @ subgoals)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   676
          | NONE => subgoal :: split_loop subgoals)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   677
    fun is_relevant t  = is_some (decomp ctxt t)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   678
    (* filter_prems_tac is_relevant: *)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   679
    val relevant_terms = filter_prems_tac_items is_relevant terms
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   680
    (* split_tac, NNF normalization: *)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   681
    val split_goals = split_loop [(Ts, relevant_terms)]
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   682
    (* necessary because split_once_tac may normalize terms: *)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   683
    val beta_eta_norm = map (apsnd (map (Envir.eta_contract o Envir.beta_norm)))
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   684
      split_goals
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   685
    (* TRY (etac notE) THEN eq_assume_tac: *)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   686
    val result = filter_out (negated_term_occurs_positively o snd) beta_eta_norm
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   687
  in
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   688
    result
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   689
  end;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   690
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   691
(* takes the i-th subgoal  [| A1; ...; An |] ==> B  to                       *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   692
(* An --> ... --> A1 --> B,  performs splitting with the given 'split_thms'  *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   693
(* (resulting in a different subgoal P), takes  P  to  ~P ==> False,         *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   694
(* performs NNF-normalization of ~P, and eliminates conjunctions,            *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   695
(* disjunctions and existential quantifiers from the premises, possibly (in  *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   696
(* the case of disjunctions) resulting in several new subgoals, each of the  *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   697
(* general form  [| Q1; ...; Qm |] ==> False.  Fails if more than            *)
31082
54a442b2d727 interface changes in linarith.ML
haftmann
parents: 30722
diff changeset
   698
(* !split_limit splits are possible.                              *)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   699
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   700
local
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   701
  val nnf_simpset =
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   702
    empty_ss setmkeqTrue mk_eq_True
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   703
    setmksimps (mksimps mksimps_pairs)
35410
1ea89d2a1bd4 more antiquotations;
wenzelm
parents: 35275
diff changeset
   704
    addsimps [@{thm imp_conv_disj}, @{thm iff_conv_conj_imp}, @{thm de_Morgan_disj},
1ea89d2a1bd4 more antiquotations;
wenzelm
parents: 35275
diff changeset
   705
      @{thm de_Morgan_conj}, not_all, not_ex, not_not]
35230
be006fbcfb96 Lin_Arith.pre_tac: inherit proper simplifier context, and get rid of posthoc renaming of bound variables;
wenzelm
parents: 35092
diff changeset
   706
  fun prem_nnf_tac ss = full_simp_tac (Simplifier.inherit_context ss nnf_simpset)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   707
in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   708
35230
be006fbcfb96 Lin_Arith.pre_tac: inherit proper simplifier context, and get rid of posthoc renaming of bound variables;
wenzelm
parents: 35092
diff changeset
   709
fun split_once_tac ss split_thms =
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   710
  let
35230
be006fbcfb96 Lin_Arith.pre_tac: inherit proper simplifier context, and get rid of posthoc renaming of bound variables;
wenzelm
parents: 35092
diff changeset
   711
    val ctxt = Simplifier.the_context ss
42361
23f352990944 modernized structure Proof_Context;
wenzelm
parents: 41468
diff changeset
   712
    val thy = Proof_Context.theory_of ctxt
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   713
    val cond_split_tac = SUBGOAL (fn (subgoal, i) =>
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   714
      let
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   715
        val Ts = rev (map snd (Logic.strip_params subgoal))
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   716
        val concl = HOLogic.dest_Trueprop (Logic.strip_assums_concl subgoal)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   717
        val cmap = Splitter.cmap_of_split_thms split_thms
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   718
        val splits = Splitter.split_posns cmap thy Ts concl
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   719
      in
32369
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   720
        if null splits orelse length splits > Config.get ctxt split_limit then
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   721
          no_tac
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   722
        else if null (#2 (hd splits)) then
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   723
          split_tac split_thms i
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   724
        else
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   725
          (* disallow a split that involves non-locally bound variables      *)
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   726
          (* (except when bound by outermost meta-quantifiers)               *)
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   727
          no_tac
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   728
      end)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   729
  in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   730
    EVERY' [
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   731
      REPEAT_DETERM o etac rev_mp,
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   732
      cond_split_tac,
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   733
      rtac ccontr,
35230
be006fbcfb96 Lin_Arith.pre_tac: inherit proper simplifier context, and get rid of posthoc renaming of bound variables;
wenzelm
parents: 35092
diff changeset
   734
      prem_nnf_tac ss,
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   735
      TRY o REPEAT_ALL_NEW (DETERM o (eresolve_tac [conjE, exE] ORELSE' etac disjE))
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   736
    ]
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   737
  end;
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   738
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   739
end;  (* local *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   740
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   741
(* remove irrelevant premises, then split the i-th subgoal (and all new      *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   742
(* subgoals) by using 'split_once_tac' repeatedly.  Beta-eta-normalize new   *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   743
(* subgoals and finally attempt to solve them by finding an immediate        *)
32369
04af689ce721 Fixed a bug where the simplifier would hang on
webertj
parents: 32091
diff changeset
   744
(* contradiction (i.e., a term and its negation) in their premises.          *)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   745
35230
be006fbcfb96 Lin_Arith.pre_tac: inherit proper simplifier context, and get rid of posthoc renaming of bound variables;
wenzelm
parents: 35092
diff changeset
   746
fun pre_tac ss i =
42439
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   747
  let
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   748
    val ctxt = Simplifier.the_context ss;
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   749
    val split_thms = filter (is_split_thm ctxt) (#splits (get_arith_data ctxt))
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   750
    fun is_relevant t = is_some (decomp ctxt t)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   751
  in
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   752
    DETERM (
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   753
      TRY (filter_prems_tac is_relevant i)
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   754
        THEN (
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   755
          (TRY o REPEAT_ALL_NEW (split_once_tac ss split_thms))
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   756
            THEN_ALL_NEW
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   757
              (CONVERSION Drule.beta_eta_conversion
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   758
                THEN'
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   759
              (TRY o (etac notE THEN' eq_assume_tac)))
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   760
        ) i
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   761
    )
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   762
  end;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   763
31100
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   764
end;  (* LA_Data *)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   765
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   766
31100
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   767
val pre_tac = LA_Data.pre_tac;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   768
31100
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   769
structure Fast_Arith = Fast_Lin_Arith(structure LA_Logic = LA_Logic and LA_Data = LA_Data);
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   770
38762
996afaa9254a slightly more abstract data handling in Fast_Lin_Arith;
wenzelm
parents: 38715
diff changeset
   771
val add_inj_thms = Fast_Arith.add_inj_thms;
996afaa9254a slightly more abstract data handling in Fast_Lin_Arith;
wenzelm
parents: 38715
diff changeset
   772
val add_lessD = Fast_Arith.add_lessD;
996afaa9254a slightly more abstract data handling in Fast_Lin_Arith;
wenzelm
parents: 38715
diff changeset
   773
val add_simps = Fast_Arith.add_simps;
996afaa9254a slightly more abstract data handling in Fast_Lin_Arith;
wenzelm
parents: 38715
diff changeset
   774
val add_simprocs = Fast_Arith.add_simprocs;
996afaa9254a slightly more abstract data handling in Fast_Lin_Arith;
wenzelm
parents: 38715
diff changeset
   775
val set_number_of = Fast_Arith.set_number_of;
31510
e0f2bb4b0021 fast_lin_arith uses proper multiplication instead of unfolding to additions
boehmes
parents: 31101
diff changeset
   776
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   777
fun simple_tac ctxt = Fast_Arith.lin_arith_tac ctxt false;
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   778
val lin_arith_tac = Fast_Arith.lin_arith_tac;
31082
54a442b2d727 interface changes in linarith.ML
haftmann
parents: 30722
diff changeset
   779
val trace = Fast_Arith.trace;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   780
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   781
(* reduce contradictory <= to False.
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   782
   Most of the work is done by the cancel tactics. *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   783
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   784
val init_arith_data =
31510
e0f2bb4b0021 fast_lin_arith uses proper multiplication instead of unfolding to additions
boehmes
parents: 31101
diff changeset
   785
  Fast_Arith.map_data (fn {add_mono_thms, mult_mono_thms, inj_thms, lessD, number_of, ...} =>
42439
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   786
   {add_mono_thms = @{thms add_mono_thms_linordered_semiring} @
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   787
      @{thms add_mono_thms_linordered_field} @ add_mono_thms,
31510
e0f2bb4b0021 fast_lin_arith uses proper multiplication instead of unfolding to additions
boehmes
parents: 31101
diff changeset
   788
    mult_mono_thms = @{thm mult_strict_left_mono} :: @{thm mult_left_mono} ::
e0f2bb4b0021 fast_lin_arith uses proper multiplication instead of unfolding to additions
boehmes
parents: 31101
diff changeset
   789
      @{lemma "a = b ==> c*a = c*b" by (rule arg_cong)} :: mult_mono_thms,
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   790
    inj_thms = inj_thms,
31082
54a442b2d727 interface changes in linarith.ML
haftmann
parents: 30722
diff changeset
   791
    lessD = lessD @ [@{thm "Suc_leI"}],
35028
108662d50512 more consistent naming of type classes involving orderings (and lattices) -- c.f. NEWS
haftmann
parents: 34974
diff changeset
   792
    neqE = [@{thm linorder_neqE_nat}, @{thm linorder_neqE_linordered_idom}],
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   793
    simpset = HOL_basic_ss
31510
e0f2bb4b0021 fast_lin_arith uses proper multiplication instead of unfolding to additions
boehmes
parents: 31101
diff changeset
   794
      addsimps @{thms ring_distribs}
e0f2bb4b0021 fast_lin_arith uses proper multiplication instead of unfolding to additions
boehmes
parents: 31101
diff changeset
   795
      addsimps [@{thm if_True}, @{thm if_False}]
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   796
      addsimps
35050
9f841f20dca6 renamed OrderedGroup to Groups; split theory Ring_and_Field into Rings Fields
haftmann
parents: 35028
diff changeset
   797
       [@{thm add_0_left},
9f841f20dca6 renamed OrderedGroup to Groups; split theory Ring_and_Field into Rings Fields
haftmann
parents: 35028
diff changeset
   798
        @{thm add_0_right},
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   799
        @{thm "Zero_not_Suc"}, @{thm "Suc_not_Zero"}, @{thm "le_0_eq"}, @{thm "One_nat_def"},
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   800
        @{thm "order_less_irrefl"}, @{thm "zero_neq_one"}, @{thm "zero_less_one"},
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   801
        @{thm "zero_le_one"}, @{thm "zero_neq_one"} RS not_sym, @{thm "not_one_le_zero"},
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   802
        @{thm "not_one_less_zero"}]
37890
aae46a9ef66c modernized abel_cancel simproc setup
haftmann
parents: 37884
diff changeset
   803
      addsimprocs [@{simproc abel_cancel_sum}, @{simproc abel_cancel_relation}]
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   804
       (*abel_cancel helps it work in abstract algebraic domains*)
31082
54a442b2d727 interface changes in linarith.ML
haftmann
parents: 30722
diff changeset
   805
      addsimprocs Nat_Arith.nat_cancel_sums_add
35410
1ea89d2a1bd4 more antiquotations;
wenzelm
parents: 35275
diff changeset
   806
      addcongs [@{thm if_weak_cong}],
31510
e0f2bb4b0021 fast_lin_arith uses proper multiplication instead of unfolding to additions
boehmes
parents: 31101
diff changeset
   807
    number_of = number_of}) #>
31082
54a442b2d727 interface changes in linarith.ML
haftmann
parents: 30722
diff changeset
   808
  add_discrete_type @{type_name nat};
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   809
29849
a2baf1b221be new attribute "arith" for facts supplied to arith.
nipkow
parents: 29548
diff changeset
   810
fun add_arith_facts ss =
41225
bd4ecd48c21f refer to regular structure Simplifier;
wenzelm
parents: 38864
diff changeset
   811
  Simplifier.add_prems (Arith_Data.get_arith_facts (Simplifier.the_context ss)) ss;
29849
a2baf1b221be new attribute "arith" for facts supplied to arith.
nipkow
parents: 29548
diff changeset
   812
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   813
val simproc = add_arith_facts #> Fast_Arith.lin_arith_simproc;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   814
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   815
26110
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   816
(* generic refutation procedure *)
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   817
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   818
(* parameters:
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   819
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   820
   test: term -> bool
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   821
   tests if a term is at all relevant to the refutation proof;
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   822
   if not, then it can be discarded. Can improve performance,
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   823
   esp. if disjunctions can be discarded (no case distinction needed!).
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   824
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   825
   prep_tac: int -> tactic
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   826
   A preparation tactic to be applied to the goal once all relevant premises
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   827
   have been moved to the conclusion.
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   828
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   829
   ref_tac: int -> tactic
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   830
   the actual refutation tactic. Should be able to deal with goals
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   831
   [| A1; ...; An |] ==> False
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   832
   where the Ai are atomic, i.e. no top-level &, | or EX
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   833
*)
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   834
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   835
local
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   836
  val nnf_simpset =
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   837
    empty_ss setmkeqTrue mk_eq_True
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   838
    setmksimps (mksimps mksimps_pairs)
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   839
    addsimps [@{thm imp_conv_disj}, @{thm iff_conv_conj_imp}, @{thm de_Morgan_disj},
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   840
      @{thm de_Morgan_conj}, @{thm not_all}, @{thm not_ex}, @{thm not_not}];
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   841
  fun prem_nnf_tac i st =
35232
f588e1169c8b renamed Simplifier.theory_context to Simplifier.global_context to emphasize that this is not the real thing;
wenzelm
parents: 35230
diff changeset
   842
    full_simp_tac (Simplifier.global_context (Thm.theory_of_thm st) nnf_simpset) i st;
26110
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   843
in
42439
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   844
26110
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   845
fun refute_tac test prep_tac ref_tac =
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   846
  let val refute_prems_tac =
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   847
        REPEAT_DETERM
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   848
              (eresolve_tac [@{thm conjE}, @{thm exE}] 1 ORELSE
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   849
               filter_prems_tac test 1 ORELSE
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   850
               etac @{thm disjE} 1) THEN
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   851
        (DETERM (etac @{thm notE} 1 THEN eq_assume_tac 1) ORELSE
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   852
         ref_tac 1);
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   853
  in EVERY'[TRY o filter_prems_tac test,
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   854
            REPEAT_DETERM o etac @{thm rev_mp}, prep_tac, rtac @{thm ccontr}, prem_nnf_tac,
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   855
            SELECT_GOAL (DEPTH_SOLVE refute_prems_tac)]
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   856
  end;
42439
9efdd0af15ac eliminated Display.string_of_thm_without_context;
wenzelm
parents: 42361
diff changeset
   857
26110
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   858
end;
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   859
06eacfd8dd9f moved refute_tac to linarith.ML
haftmann
parents: 26101
diff changeset
   860
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   861
(* arith proof method *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   862
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   863
local
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   864
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   865
fun raw_tac ctxt ex =
33035
15eab423e573 standardized basic operations on type option;
wenzelm
parents: 32863
diff changeset
   866
  (* FIXME: K true should be replaced by a sensible test (perhaps "is_some o
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   867
     decomp sg"? -- but note that the test is applied to terms already before
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   868
     they are split/normalized) to speed things up in case there are lots of
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   869
     irrelevant terms involved; elimination of min/max can be optimized:
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   870
     (max m n + k <= r) = (m+k <= r & n+k <= r)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   871
     (l <= min m n + k) = (l <= m+k & l <= n+k)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   872
  *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   873
  refute_tac (K true)
33728
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   874
    (* Splitting is also done inside simple_tac, but not completely --    *)
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   875
    (* split_tac may use split theorems that have not been implemented in *)
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   876
    (* simple_tac (cf. pre_decomp and split_once_items above), and        *)
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   877
    (* split_limit may trigger.                                           *)
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   878
    (* Therefore splitting outside of simple_tac may allow us to prove    *)
cb4235333c30 Fixed splitting of div and mod on integers (split theorem differed from implementation).
webertj
parents: 33719
diff changeset
   879
    (* some goals that simple_tac alone would fail on.                    *)
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   880
    (REPEAT_DETERM o split_tac (#splits (get_arith_data ctxt)))
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   881
    (lin_arith_tac ctxt ex);
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   882
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   883
in
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   884
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   885
fun gen_tac ex ctxt = FIRST' [simple_tac ctxt,
35625
9c818cab0dd0 modernized structure Object_Logic;
wenzelm
parents: 35410
diff changeset
   886
  Object_Logic.full_atomize_tac THEN' (REPEAT_DETERM o rtac impI) THEN' raw_tac ctxt ex];
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   887
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   888
val tac = gen_tac true;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   889
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   890
end;
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   891
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   892
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   893
(* context setup *)
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   894
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   895
val setup =
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   896
  init_arith_data #>
41468
wenzelm
parents: 41225
diff changeset
   897
  Simplifier.map_ss (fn ss => ss addsimprocs [Simplifier.simproc_global @{theory} "fast_nat_arith"
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   898
    ["(m::nat) < n","(m::nat) <= n", "(m::nat) = n"] (K simproc)]
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   899
    (* Because of fast_nat_arith_simproc, the arithmetic solver is really only
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   900
    useful to detect inconsistencies among the premises for subgoals which are
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   901
    *not* themselves (in)equalities, because the latter activate
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   902
    fast_nat_arith_simproc anyway. However, it seems cheaper to activate the
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   903
    solver all the time rather than add the additional check. *)
29850
14d9891c917b fix to [arith]
nipkow
parents: 29849
diff changeset
   904
    addSolver (mk_solver' "lin_arith"
31100
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   905
      (add_arith_facts #> Fast_Arith.cut_lin_arith_tac)))
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   906
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   907
val global_setup =
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   908
  setup_split_limit #> setup_neq_limit #>
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   909
  Attrib.setup @{binding arith_split} (Scan.succeed (Thm.declaration_attribute add_split))
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   910
    "declaration of split rules for arithmetic procedure" #>
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   911
  Method.setup @{binding linarith}
33554
4601372337e4 eliminated some unused/obsolete Args.bang_facts;
wenzelm
parents: 33520
diff changeset
   912
    (Scan.succeed (fn ctxt =>
31100
6a2e67fe4488 tuned interface of Lin_Arith
haftmann
parents: 31082
diff changeset
   913
      METHOD (fn facts =>
33554
4601372337e4 eliminated some unused/obsolete Args.bang_facts;
wenzelm
parents: 33520
diff changeset
   914
        HEADGOAL (Method.insert_tac (Arith_Data.get_arith_facts ctxt @ facts)
31101
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   915
          THEN' tac ctxt)))) "linear arithmetic" #>
26c7bb764a38 qualified names for Lin_Arith tactics and simprocs
haftmann
parents: 31100
diff changeset
   916
  Arith_Data.add_tactic "linear arithmetic" gen_tac;
24092
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   917
71c27b320610 HOL setup for linear arithmetic -- moved here from arith_data.ML;
wenzelm
parents:
diff changeset
   918
end;