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IOA/meta_theory/Option.thy
author clasohm
Wed, 02 Nov 1994 11:50:09 +0100
changeset 156 fd1be45b64bf
child 168 44ff2275d44f
permissions -rw-r--r--
added IOA to isabelle/HOL
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Option = Arith +
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datatype 'a option = None | Some('a)
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end
Old_HOL