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Existence of 4-GDDs with at most 50 points and 4-GDDs of types 6s3t and 9s3t
Discrete Mathematics ( IF 0.7 ) Pub Date : 2021-05-28 , DOI: 10.1016/j.disc.2021.112479 R. Julian R. Abel , Yudhistira A. Bunjamin , Diana Combe
中文翻译:
存在最多 50 个点的 4-GDD 和类型为 6 s 3 t和 9 s 3 t 的4-GDD
更新日期:2021-05-28
Discrete Mathematics ( IF 0.7 ) Pub Date : 2021-05-28 , DOI: 10.1016/j.disc.2021.112479 R. Julian R. Abel , Yudhistira A. Bunjamin , Diana Combe
In this paper we give two new refinements to the known necessary conditions for the existence of a 4-GDD and list all the feasible group types for 4-GDDs where the number of points v satisfies . For v in this range, we obtain solutions for all feasible group types when , and solutions for all feasible types of the form except . We also obtain various other 4-GDDs. These include solutions for 4-GDDs of types and for all but a finite number of feasible values of s and t.
中文翻译:
存在最多 50 个点的 4-GDD 和类型为 6 s 3 t和 9 s 3 t 的4-GDD
在本文中,我们对 4-GDD 存在的已知必要条件给出了两个新的改进,并列出了 4-GDD 的所有可行组类型,其中点数v满足. 对于这个范围内的v,我们得到所有可行组类型的解,当 , 以及所有可行类型的形式的解决方案 除了 . 我们还获得了其他各种 4-GDD。其中包括 4-GDD 类型的解决方案 和 除了有限数量的s和t的可行值之外的所有值。