Tue, 21 Jan 1997 10:58:32 +0100 Simplified proofs
paulson [Tue, 21 Jan 1997 10:58:32 +0100] rev 2533
Simplified proofs
Tue, 21 Jan 1997 10:54:05 +0100 Improved layout and updated comments
paulson [Tue, 21 Jan 1997 10:54:05 +0100] rev 2532
Improved layout and updated comments
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