Directed covering with block size 5 and index even

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A directed covering design, DC(v,k,λ), is a (v,k,λ) covering design in which the blocks are regarded as ordered k-tuples and in which each ordered pair of elements occurs in at least λ blocks. Let DE(v,k,λ) denote the minimum number of blocks in a DC(v,k,λ). In this paper the values of the function DE(v,5,λ) are determined for all positive integers v≥5 and λ even.

Original languageEnglish
Pages (from-to)27-40
Number of pages14
JournalDiscrete Mathematics
Issue number1-3
StatePublished - Jun 28 1998


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