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src/HOL/IOA/meta_theory/Option.thy
author paulson
Thu, 18 Jan 1996 10:38:29 +0100
changeset 1444 23ceb1dc9755
parent 1052 e044350bfa52
permissions -rw-r--r--
trivial updates

(*  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