Title
Block-avoiding point sequencings of directed triple systems
Abstract
A directed triple system of order v (or, DTS (v)) is a decomposition of the complete directed graph Kv→ into transitive triples. A v-good sequencing of a DTS (v) is a permutation of the points of the design, say [x1⋯xv], such that, for every triple (x,y,z) in the design, it is not the case that x=xi, y=xj and z=xk with i<j<k. We prove that there exists a DTS (v) having a v-good sequencing for all positive integers v≡0,1mod3. Further, for all positive integers v≡0,1mod3, v≥7, we prove that there is a DTS (v) that does not have a v-good sequencing. We also derive some computational results concerning v-good sequencings of all the nonisomorphic DTS (v) for v≤7.
Year
DOI
Venue
2020
10.1016/j.disc.2019.111773
Discrete Mathematics
Keywords
DocType
Volume
Directed triple system,Sequencing
Journal
343
Issue
ISSN
Citations 
4
0012-365X
1
PageRank 
References 
Authors
0.40
0
3
Name
Order
Citations
PageRank
Donald L. Kreher118725.11
Douglas R. Stinson22387274.83
Shannon Veitch321.80