src/HOL/Prod.thy
author regensbu
Fri Oct 06 16:17:08 1995 +0100 (1995-10-06)
changeset 1273 6960ec882bca
parent 1114 c8dfb56a7e95
child 1370 7361ac9b024d
permissions -rw-r--r--
added 8bit pragmas
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(*  Title:      HOL/Prod.thy
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    ID:         Prod.thy,v 1.5 1994/08/19 09:04:27 lcp Exp
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    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
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    Copyright   1992  University of Cambridge
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Ordered Pairs and the Cartesian product type.
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The unit type.
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*)
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Prod = Fun +
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(** Products **)
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(* type definition *)
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consts
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  Pair_Rep      :: "['a, 'b] => ['a, 'b] => bool"
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defs
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  Pair_Rep_def  "Pair_Rep == (%a b. %x y. x=a & y=b)"
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subtype (Prod)
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  ('a, 'b) "*"          (infixr 20)
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    = "{f. ? a b. f = Pair_Rep (a::'a) (b::'b)}"
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(* abstract constants and syntax *)
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consts
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  fst           :: "'a * 'b => 'a"
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  snd           :: "'a * 'b => 'b"
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  split         :: "[['a, 'b] => 'c, 'a * 'b] => 'c"
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  prod_fun      :: "['a => 'b, 'c => 'd, 'a * 'c] => 'b * 'd"
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  Pair          :: "['a, 'b] => 'a * 'b"
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  Sigma         :: "['a set, 'a => 'b set] => ('a * 'b) set"
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(** Patterns -- extends pre-defined type "pttrn" used in abstractions **)
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types pttrns
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syntax
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  "@Tuple"      :: "['a, args] => 'a * 'b"            ("(1'(_,/ _'))")
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  "@pttrn"  :: "[pttrn,pttrns] => pttrn"              ("'(_,/_')")
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  ""        :: " pttrn         => pttrns"             ("_")
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  "@pttrns" :: "[pttrn,pttrns] => pttrns"             ("_,/_")
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translations
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  "(x, y, z)"   == "(x, (y, z))"
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  "(x, y)"      == "Pair x y"
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  "%(x,y,zs).b"   == "split(%x (y,zs).b)"
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  "%(x,y).b"      == "split(%x y.b)"
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(* The <= direction fails if split has more than one argument because
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   ast-matching fails. Otherwise it would work fine *)
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defs
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  Pair_def      "Pair a b == Abs_Prod(Pair_Rep a b)"
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  fst_def       "fst(p) == @a. ? b. p = (a, b)"
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  snd_def       "snd(p) == @b. ? a. p = (a, b)"
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  split_def     "split c p == c (fst p) (snd p)"
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  prod_fun_def  "prod_fun f g == split(%x y.(f(x), g(y)))"
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  Sigma_def     "Sigma A B == UN x:A. UN y:B(x). {(x, y)}"
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(** Unit **)
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subtype (Unit)
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  unit = "{p. p = True}"
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consts
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  "()"          :: "unit"                           ("'(')")
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defs
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  Unity_def     "() == Abs_Unit(True)"
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(* start 8bit 1 *)
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(* end 8bit 1 *)
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end
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(*
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ML
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local open Syntax
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fun pttrn(_ $ s $ t) = const"@pttrn" $ s $ t;
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fun pttrns s t = const"@pttrns" $ s $ t;
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fun split2(Abs(x,T,t)) =
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      let val (pats,u) = split1 t
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      in (pttrns (Free(x,T)) pats, subst_bounds([free x],u)) end
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  | split2(Const("split",_) $ r) =
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      let val (pats,s) = split2(r)
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          val (pats2,t) = split1(s)
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      in (pttrns (pttrn pats) pats2, t) end
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and split1(Abs(x,T,t)) =  (Free(x,T), subst_bounds([free x],t))
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  | split1(Const("split",_)$t) = split2(t);
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fun split_tr'(t::args) =
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  let val (pats,ft) = split2(t)
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  in list_comb(const"_lambda" $ pttrn pats $ ft, args) end;
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in
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val print_translation = [("split", split_tr')];
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end;
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*)