Fri, 02 Jul 2010 17:27:44 +0200 haftmann explicit code_datatype declaration prevents multiple instantiations later on
Fri, 02 Jul 2010 16:50:53 +0200 haftmann refrain from using datatype declaration -- opens chance for quickcheck later on
Fri, 02 Jul 2010 16:50:52 +0200 haftmann tuned proof
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