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src/HOL/IOA/meta_theory/Option.thy
author lcp
Tue, 25 Apr 1995 11:14:03 +0200
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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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