ISSN:
1420-8997
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mathematics
Notes:
Abstract In at-(v, k,λ) directed design the blocks are orderedk-tuples and every orderedt-tuple of distinct points occurs in exactly λ blocks (as a subsequence). We studyt−(v, 5, 1) directed designs witht=3 andt=4. In particular, we construct the first known examples, and an infinite class, of 3-(v, 5, 1) directed designs, and the first known infinite class of 4-(v, 5, 1) directed designs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01220297
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