Wed, 14 Sep 2011 13:00:44 +0000 urbanc clarified proof about non-regularity
Wed, 14 Sep 2011 11:46:50 +0000 urbanc corrected typo found by Xingyuan
Tue, 13 Sep 2011 12:00:53 +0000 urbanc small typo
Mon, 12 Sep 2011 19:50:21 +0000 urbanc a final polishing before submitting later this week
(0) -100 -30 -10 -4 +4 +10 +30 +100 tip