author | clasohm |
Tue, 30 Jan 1996 15:24:36 +0100 | |
changeset 1465 | 5d7a7e439cec |
parent 1454 | d0266c81a85e |
child 1475 | 7f5a4cd08209 |
permissions | -rw-r--r-- |
923 | 1 |
(* 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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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 |