AK-type stability theorems on cross t-intersecting families
AK-type stability theorems on cross t-intersecting families
复制标题
交叉t相交族上的AK型稳定性定理
DOI:
10.1016/j.ejc.2019.07.004
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Norihide
中科院分区:
文献类型:
--
作者:
Lee;Sang June; Siggers;Mark; Tokushige;Norihide
Two families, A and B, of subsets of [n] are cross t-intersecting if for every A∈ A and B∈ B, A and B intersect in at least t elements. For a real number p and a family A the product measure μ p (A) is defined as the sum of p| A|(1− p) n−| A| over all A∈ A. For every non-negative integer r, and for large enough t, we determine, for any p satisfying r t+ 2 r− 1≤ p≤ r+ 1 t+ 2 r+ 1, the maximum possible value of μ p (A) μ p (B) for cross t-intersecting families A and B. In this paper we prove a stronger stability result which yields the above result.
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J. Comb. Theory, Ser. A
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