Thu, 22 Oct 2009 11:43:12 +0200 Cezary Kaliszyk Simplified the proof with some tactic... Still hangs sometimes.
Thu, 22 Oct 2009 10:45:33 +0200 Cezary Kaliszyk More proof
(0) -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 tip