Fri, 25 Jul 2003 17:21:22 +0200 nipkow Replaced \<leadsto> by \<rightharpoonup>
Fri, 25 Jul 2003 10:52:15 +0200 paulson Simplified a proof using presburger
Thu, 24 Jul 2003 18:23:17 +0200 paulson new theory Library/NatPair
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