Thu, 10 Apr 1997 18:07:27 +0200 paulson Updated discussion and references for inductive definitions
Thu, 10 Apr 1997 14:26:01 +0200 nipkow Deleted stupid proof at the end not needed anywhere.
Thu, 10 Apr 1997 12:21:21 +0200 nipkow Mod because of "Turned Addsimps into AddIffs for datatype laws."
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