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JCT
2011
14 years 9 months ago
2011
The neighborhood of a pair of vertices u, v in a triple system is the set of vertices w such that uvw is an edge. A triple system H is semi-bipartite if its vertex set contains a ...
DM
2006
15 years 2 months ago
2006
Let {v; b2, b1} denote the class of extended directed triple systems of the order v in which the number of blocks of the form [a, b, a] is b2 and