Fri, 14 Jan 2000 12:17:53 +0100 paulson still working; a bit of polishing
Thu, 13 Jan 2000 17:36:58 +0100 paulson new lemmas for Ntree recursor example; more simprules; more lemmas borrowed
Thu, 13 Jan 2000 17:36:02 +0100 paulson change for new rewriting
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