src/HOL/Set.thy
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(*  Title:      HOL/Set.thy
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    ID:         $Id$
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    Author:     Tobias Nipkow
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    Copyright   1993  University of Cambridge
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*)
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Set = Ord +
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(** Core syntax **)
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types
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  'a set
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arities
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  set :: (term) term
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instance
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  set :: (term) {ord, minus}
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consts
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  "{}"          :: 'a set                           ("{}")
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  insert        :: ['a, 'a set] => 'a set
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  Collect       :: ('a => bool) => 'a set               (*comprehension*)
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  Compl         :: ('a set) => 'a set                   (*complement*)
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  Int           :: ['a set, 'a set] => 'a set       (infixl 70)
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  Un            :: ['a set, 'a set] => 'a set       (infixl 65)
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  UNION, INTER  :: ['a set, 'a => 'b set] => 'b set     (*general*)
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  UNION1        :: ['a => 'b set] => 'b set         (binder "UN " 10)
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  INTER1        :: ['a => 'b set] => 'b set         (binder "INT " 10)
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  Union, Inter  :: (('a set) set) => 'a set             (*of a set*)
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  Pow           :: 'a set => 'a set set                 (*powerset*)
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  range         :: ('a => 'b) => 'b set                 (*of function*)
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  Ball, Bex     :: ['a set, 'a => bool] => bool         (*bounded quantifiers*)
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  inj, surj     :: ('a => 'b) => bool                   (*inj/surjective*)
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  inj_onto      :: ['a => 'b, 'a set] => bool
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  "``"          :: ['a => 'b, 'a set] => ('b set)   (infixr 90)
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  (*membership*)
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  "op :"        :: ['a, 'a set] => bool             ("(_/ : _)" [50, 51] 50)
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(** Additional concrete syntax **)
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syntax
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  "op :"        :: ['a, 'a set] => bool               ("op :")
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  UNIV          :: 'a set
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  (* Infix syntax for non-membership *)
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  "op ~:"       :: ['a, 'a set] => bool               ("(_/ ~: _)" [50, 51] 50)
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  "op ~:"       :: ['a, 'a set] => bool               ("op ~:")
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  "@Finset"     :: args => 'a set                     ("{(_)}")
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  "@Coll"       :: [pttrn, bool] => 'a set            ("(1{_./ _})")
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  "@SetCompr"   :: ['a, idts, bool] => 'a set         ("(1{_ |/_./ _})")
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  (* Big Intersection / Union *)
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  "@INTER"      :: [pttrn, 'a set, 'b set] => 'b set  ("(3INT _:_./ _)" 10)
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  "@UNION"      :: [pttrn, 'a set, 'b set] => 'b set  ("(3UN _:_./ _)" 10)
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  (* Bounded Quantifiers *)
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  "@Ball"       :: [pttrn, 'a set, bool] => bool      ("(3! _:_./ _)" 10)
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  "@Bex"        :: [pttrn, 'a set, bool] => bool      ("(3? _:_./ _)" 10)
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  "*Ball"       :: [pttrn, 'a set, bool] => bool      ("(3ALL _:_./ _)" 10)
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  "*Bex"        :: [pttrn, 'a set, bool] => bool      ("(3EX _:_./ _)" 10)
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translations
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  "UNIV"        == "Compl {}"
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  "range f"     == "f``UNIV"
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  "x ~: y"      == "~ (x : y)"
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  "{x, xs}"     == "insert x {xs}"
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  "{x}"         == "insert x {}"
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  "{x. P}"      == "Collect (%x. P)"
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  "INT x:A. B"  == "INTER A (%x. B)"
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  "UN x:A. B"   == "UNION A (%x. B)"
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  "! x:A. P"    == "Ball A (%x. P)"
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  "? x:A. P"    == "Bex A (%x. P)"
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  "ALL x:A. P"  => "Ball A (%x. P)"
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  "EX x:A. P"   => "Bex A (%x. P)"
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syntax (symbols)
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  "op Int"      :: ['a set, 'a set] => 'a set         (infixl "\\<inter>" 70)
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  "op Un"       :: ['a set, 'a set] => 'a set         (infixl "\\<union>" 65)
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  "op :"        :: ['a, 'a set] => bool               ("(_/ \\<in> _)" [50, 51] 50)
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  "op :"        :: ['a, 'a set] => bool               ("op \\<in>")
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  "op ~:"       :: ['a, 'a set] => bool               ("(_/ \\<notin> _)" [50, 51] 50)
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  "op ~:"       :: ['a, 'a set] => bool               ("op \\<notin>")
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  "UN "         :: [idts, bool] => bool               ("(3\\<Union> _./ _)" 10)
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  "INT "        :: [idts, bool] => bool               ("(3\\<Inter> _./ _)" 10)
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  "@UNION"      :: [pttrn, 'a set, 'b set] => 'b set  ("(3\\<Union> _\\<in>_./ _)" 10)
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  "@INTER"      :: [pttrn, 'a set, 'b set] => 'b set  ("(3\\<Inter> _\\<in>_./ _)" 10)
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  Union         :: (('a set) set) => 'a set           ("\\<Union> _" [90] 90)
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  Inter         :: (('a set) set) => 'a set           ("\\<Inter> _" [90] 90)
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  "@Ball"       :: [pttrn, 'a set, bool] => bool      ("(3\\<forall> _\\<in>_./ _)" 10)
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  "@Bex"        :: [pttrn, 'a set, bool] => bool      ("(3\\<exists> _\\<in>_./ _)" 10)
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  "*Ball"       :: [pttrn, 'a set, bool] => bool      ("(3\\<forall> _\\<in>_./ _)" 10)
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  "*Bex"        :: [pttrn, 'a set, bool] => bool      ("(3\\<exists> _\\<in>_./ _)" 10)
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(** Rules and definitions **)
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rules
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  (* Isomorphisms between Predicates and Sets *)
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  mem_Collect_eq    "(a : {x.P(x)}) = P(a)"
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  Collect_mem_eq    "{x.x:A} = A"
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defs
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  Ball_def      "Ball A P       == ! x. x:A --> P(x)"
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  Bex_def       "Bex A P        == ? x. x:A & P(x)"
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  subset_def    "A <= B         == ! x:A. x:B"
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  Compl_def     "Compl(A)       == {x. ~x:A}"
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  Un_def        "A Un B         == {x.x:A | x:B}"
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  Int_def       "A Int B        == {x.x:A & x:B}"
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  set_diff_def  "A - B          == {x. x:A & ~x:B}"
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  INTER_def     "INTER A B      == {y. ! x:A. y: B(x)}"
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  UNION_def     "UNION A B      == {y. ? x:A. y: B(x)}"
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  INTER1_def    "INTER1(B)      == INTER {x.True} B"
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  UNION1_def    "UNION1(B)      == UNION {x.True} B"
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  Inter_def     "Inter(S)       == (INT x:S. x)"
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  Union_def     "Union(S)       == (UN x:S. x)"
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  Pow_def       "Pow(A)         == {B. B <= A}"
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  empty_def     "{}             == {x. False}"
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  insert_def    "insert a B     == {x.x=a} Un B"
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  image_def     "f``A           == {y. ? x:A. y=f(x)}"
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  inj_def       "inj(f)         == ! x y. f(x)=f(y) --> x=y"
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  inj_onto_def  "inj_onto f A   == ! x:A. ! y:A. f(x)=f(y) --> x=y"
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  surj_def      "surj(f)        == ! y. ? x. y=f(x)"
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(* start 8bit 1 *)
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(* end 8bit 1 *)
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end
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923
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ML
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local
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(* Translates between { e | x1..xn. P} and {u. ? x1..xn. u=e & P}      *)
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(* {y. ? x1..xn. y = e & P} is only translated if [0..n] subset bvs(e) *)
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val ex_tr = snd(mk_binder_tr("? ","Ex"));
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fun nvars(Const("_idts",_) $ _ $ idts) = nvars(idts)+1
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  | nvars(_) = 1;
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fun setcompr_tr[e,idts,b] =
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  let val eq = Syntax.const("op =") $ Bound(nvars(idts)) $ e
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      val P = Syntax.const("op &") $ eq $ b
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      val exP = ex_tr [idts,P]
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  in Syntax.const("Collect") $ Abs("",dummyT,exP) end;
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val ex_tr' = snd(mk_binder_tr' ("Ex","DUMMY"));
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fun setcompr_tr'[Abs(_,_,P)] =
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  let fun ok(Const("Ex",_)$Abs(_,_,P),n) = ok(P,n+1)
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        | ok(Const("op &",_) $ (Const("op =",_) $ Bound(m) $ e) $ _, n) =
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            if n>0 andalso m=n andalso
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              ((0 upto (n-1)) subset add_loose_bnos(e,0,[]))
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            then () else raise Match
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      fun tr'(_ $ abs) =
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        let val _ $ idts $ (_ $ (_ $ _ $ e) $ Q) = ex_tr'[abs]
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        in Syntax.const("@SetCompr") $ e $ idts $ Q end
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  in ok(P,0); tr'(P) end;
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in
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val parse_translation = [("@SetCompr", setcompr_tr)];
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val print_translation = [("Collect", setcompr_tr')];
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val print_ast_translation =
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  map HOL.alt_ast_tr' [("@Ball", "*Ball"), ("@Bex", "*Bex")];
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end;