Mon, 02 Oct 2006 18:30:10 +0200 huffman add lemmas norm_not_less_zero, norm_le_zero_iff
(0) -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip