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math.CO2016★ 1 cited
Conference matrices with maximum excess and two-intersection sets
Koji Momihara, Sho Suda
A two-intersection set with parameters for a block design is a -subset of the point set of the design, which intersects every block in or points. In this paper…
math.CO2016
Upper bounds on the size of transitive subtournaments in digraphs
Koji Momihara, Sho Suda
In this paper, we consider upper bounds on the size of transitive subtournaments in a digraph. In particular, we give an analogy of Hoffman's bound for the size of cocliques in a r…