Thu, 23 Jun 2011 09:04:20 -0700 huffman added number_semiring class, plus a few new lemmas;
Thu, 23 Jun 2011 16:31:20 +0200 blanchet merged
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip