Fri, 10 Apr 1998 13:40:29 +0200 paulson can prove the empty relation to be WF
Fri, 10 Apr 1998 13:15:28 +0200 paulson Fixed bug in inductive sections to allow disjunctive premises;
Thu, 09 Apr 1998 12:31:35 +0200 paulson Clearer description of recdef, including use of {}
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