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src/HOL/Option.thy
author paulson
Thu, 09 Jan 1997 10:22:42 +0100
changeset 2498 7914881f47c0
parent 2019 b45d9f2042e0
child 4133 0a08c2b9b1ed
permissions -rw-r--r--
New theorem add_leE

(*  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