On covering a product of sets with products of their subsets

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Suppose that S1,...,SN are collections of subsets of X1,...,XN, respectively, such that ni subsets belonging to Si, and no fewer, cover Xi for all i. the main result of this paper is that to cover X1 x...x XN requires no fewer than σNi=1 (ni-1) + 1 and no more than ΠNi=1ni subsets of the form A1 x...x AN, where Ai∈S1 for all i. Moreo ver, these bounds cannot be improved. Identical bounds for the spanning number of a normal product of graphs are also obtained.

Original languageEnglish (US)
Pages (from-to)373-380
Number of pages8
JournalDiscrete Mathematics
Issue number4
StatePublished - Aug 1973
Externally publishedYes

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