The k-th most frequent element in any union-closed set family appears in at least 1/(2^{k-1}+1) of the sets, with equality only for the near-k-cube families.
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Frequent elements in union-closed set families
The k-th most frequent element in any union-closed set family appears in at least 1/(2^{k-1}+1) of the sets, with equality only for the near-k-cube families.