Thu, 23 Jun 2011 23:05:38 +0200 wenzelm clarified EXCEPTIONS [] (cf. Exn.is_interrupt and Runtime.exn_message);
Thu, 23 Jun 2011 20:30:48 +0200 wenzelm more robust concurrent builds;
Thu, 23 Jun 2011 10:08:35 -0700 huffman merged
Thu, 23 Jun 2011 10:07:16 -0700 huffman add countable_datatype method for proving countable class instances
Thu, 23 Jun 2011 18:32:13 +0200 wenzelm merged;
Thu, 23 Jun 2011 09:16:48 -0700 huffman instance inat :: number_semiring
Thu, 23 Jun 2011 09:04:20 -0700 huffman added number_semiring class, plus a few new lemmas;
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