Thu, 11 Jun 2015 10:44:04 +0200 wenzelm tuned signature;
Thu, 11 Jun 2015 10:03:54 +0200 wenzelm tuned;
Sat, 13 Jun 2015 19:23:41 +0100 paulson streamlined many more proofs
Sat, 13 Jun 2015 12:31:23 +0100 paulson Merge
Sat, 13 Jun 2015 12:30:12 +0100 paulson tidied more proofs
Fri, 12 Jun 2015 21:53:07 +0200 haftmann proper subclass instances for existing gcd (semi)rings
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