Mon, 10 Dec 2012 10:41:29 +0100 wenzelm clarified transitive_closure: proper cumulation of transitive steps, which is essential for Warshall-style algorithms;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 tip