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math.CO2012★ 1 cited
Even-freeness of cyclic 2-designs
Yuichiro Fujiwara
A Steiner 2-design of block size k is an ordered pair (V, B) of finite sets such that B is a family of k-subsets of V in which each pair of elements of V appears exactly once. A St…
math.CO2012
Sparseness of 4-cycle systems
Yuichiro Fujiwara, Shung-Liang Wu, Hung-Lin Fu
An avoidance problem of configurations in 4-cycle systems is investigated by generalizing the notion of sparseness, which is originally from Erdős' r-sparse conjecture on Steiner t…