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Open Accesshttps://doi.org/10.1016/0097-3165(74)90044-2
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Cite Publication Date: Mar 1, 1974 | |
 Citations: 4 |  License type: elsevier-specific: oa user license |
Affiliation: Hebrew University of Jerusalem
A sufficient condition for the existence of a system of distinct representatives for a family S is that x ϵ A ϵ S implies the number of elements of A is not smaller than the number of sets in S to which x belongs.
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