Fri, 23 Dec 2011 15:34:18 +0100 huffman add lemmas bin_cat_zero and bin_split_zero
Fri, 23 Dec 2011 15:24:22 +0100 huffman more uses of 'induct arbitrary'
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip