Thu, 17 Jan 2002 12:45:52 +0100 new definitions from Sidi Ehmety
paulson [Thu, 17 Jan 2002 12:45:52 +0100] rev 12789
new definitions from Sidi Ehmety
Thu, 17 Jan 2002 12:45:36 +0100 made proofs more robust
paulson [Thu, 17 Jan 2002 12:45:36 +0100] rev 12788
made proofs more robust
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