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src/HOL/Option.thy
author paulson
Mon, 26 May 1997 12:38:29 +0200
changeset 3342 ec3b55fcb165
parent 2019 b45d9f2042e0
child 4133 0a08c2b9b1ed
permissions -rw-r--r--
New operator "lists" for formalizing sets of lists
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2019
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(*  Title:      Option.thy
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    ID:         $Id$
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    Author:     Tobias Nipkow
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    Copyright   1994  TU Muenchen
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Datatype 'a option













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*)













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Option = Arith +













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datatype 'a option = None | Some 'a













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end















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