Journal of Combinatorial Theory, Series AVolume 23, Issue 3, November 1977, Pages 341-343NoteAn extremal problem among subsets of a setAuthor links open overlay panelShuo-Yen Robert LiShow moreShareCitehttps://doi.org/10.1016/0097-3165(77)90025-5Get rights and contentUnder an Elsevier user licenseopen archiveAbstractWe determine the maximum size of a family of subsets in {1, 2,…, n} with the property that if A1, A2, A3,… are any members of the family with ∩Ai = ⊘, then ∪Ai = {1, 2,…, n}.Previous article in issueNext article in issueRecommended articlesCited by (0)Copyright © 1977 Published by Elsevier Inc.