Group divisible designs with block size 4 and group sizes 2 and 5
| Autor: | R. Julian R. Abel, Thomas Britz, Yudhistira A. Bunjamin, Diana Combe |
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| Rok vydání: | 2021 |
| Předmět: | |
| DOI: | 10.48550/arxiv.2109.11221 |
| Popis: | In this paper we provide a $4$-GDD of type $2^2 5^5$, thereby solving the existence question for the last remaining feasible type for a $4$-GDD with no more than $30$ points. We then show that $4$-GDDs of type $2^t 5^s$ exist for all but a finite specified set of feasible pairs $(t,s)$. |
| Databáze: | OpenAIRE |
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