Tue, 24 Nov 2009 16:34:39 +0100 Christian Urban tuned solution with comb_conv
Sun, 22 Nov 2009 15:27:10 +0100 Christian Urban updated to new Isabelle and clarified Skip_Proof
(0) -300 -100 -30 -10 -2 +2 +10 +30 +100 tip