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src/HOL/Option.thy
author wenzelm
Tue, 27 May 1997 15:45:07 +0200
changeset 3362 0b268cff9344
parent 2019 b45d9f2042e0
child 4133 0a08c2b9b1ed
permissions -rw-r--r--
NJ 1.09.2x as factory default!

(*  Title:      Option.thy
    ID:         $Id$
    Author:     Tobias Nipkow
    Copyright   1994  TU Muenchen

Datatype 'a option
*)

Option = Arith +
datatype 'a option = None | Some 'a
end
isabelle