src/HOL/UNITY/Union.thy
author paulson
Mon Oct 05 10:22:49 1998 +0200 (1998-10-05)
changeset 5611 6957f124ca97
parent 5596 b29d18d8c4d2
child 5648 fe887910e32e
permissions -rw-r--r--
Join now an infix operator
     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 F == mk_program (INT i:I. Init (F i), UN i:I. Acts (F i))"
    16 
    17    Join :: ['a program, 'a program] => 'a program      (infixl 65)
    18     "F Join G == mk_program (Init F Int Init G, Acts F Un Acts G)"
    19 
    20    SKIP :: 'a program
    21     "SKIP == mk_program (UNIV, {})"
    22 
    23 syntax
    24   "@JOIN"      :: [pttrn, 'a set, 'b set] => 'b set  ("(3JN _:_./ _)" 10)
    25 
    26 translations
    27   "JN x:A. B"   == "JOIN A (%x. B)"
    28 
    29 end