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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
Option = Arith +
datatype 'a option = None | Some('a)
end