Wed, 02 Jan 2008 17:26:19 +0100 add lemma dir2dir_monofun
huffman [Wed, 02 Jan 2008 17:26:19 +0100] rev 25779
add lemma dir2dir_monofun
(0) -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip