src/HOL/UNITY/Union.thy
author paulson
Thu Oct 01 18:28:18 1998 +0200 (1998-10-01)
changeset 5596 b29d18d8c4d2
parent 5584 aad639e56d4e
child 5611 6957f124ca97
permissions -rw-r--r--
abstype of programs
     1 (*  Title:      HOL/UNITY/Union.thy
     2     ID:         $Id$
     3     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
     4     Copyright   1998  University of Cambridge
     5 
     6 Unions of programs
     7 
     8 From Misra's Chapter 5: Asynchronous Compositions of Programs
     9 *)
    10 
    11 Union = SubstAx + FP +
    12 
    13 constdefs
    14    JOIN  :: ['a set, 'a => 'b program] => 'b program
    15     "JOIN I prg == mk_program (INT i:I. Init (prg i),
    16 			       UN  i:I. Acts (prg i))"
    17 
    18    Join :: ['a program, 'a program] => 'a program
    19     "Join prgF prgG == mk_program (Init prgF Int Init prgG,
    20 				   Acts prgF Un Acts prgG)"
    21 
    22    SKIP :: 'a program
    23     "SKIP == mk_program (UNIV, {})"
    24 
    25 syntax
    26   "@JOIN"      :: [pttrn, 'a set, 'b set] => 'b set  ("(3JN _:_./ _)" 10)
    27 
    28 translations
    29   "JN x:A. B"   == "JOIN A (%x. B)"
    30 
    31 end