A hypergraph Turán theorem via lagrangians of intersecting families

A hypergraph Turán theorem via lagrangians of intersecting families
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DOI:
10.1016/j.jcta.2013.07.011
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发表时间:
2013-07
期刊:
J. Comb. Theory A
影响因子:
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通讯作者:
Dan Hefetz;Peter Keevash
Dan Hefetz;Peter Keevash
中科院分区:
其他
文献类型:
--
作者:
Dan Hefetz;Peter Keevash

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设K3,33是具有15个顶点{xi,yi:1 <$i <$3}和{zi j:1 <$i,j <$3},11条边{x1,x2,x3},{y1,y2,y3}和{{xi,yj,zi j}:1 <$i,j <$3}的3-图。我们证明了对于大的n,唯一的最大的n阶K3,33-free 3-图是5阶完全3-图的平衡爆破.我们的证明使用的稳定性方法和结果的拉格朗日相交的家庭,有独立的利益。
Abstract Let K 3, 3 3 be the 3-graph with 15 vertices {x i, y i: 1⩽ i⩽ 3} and {z i j: 1⩽ i, j⩽ 3}, and 11 edges {x 1, x 2, x 3},{y 1, y 2, y 3} and {{x i, y j, z i j}: 1⩽ i, j⩽ 3}. We show that for large n, the unique largest K 3, 3 3-free 3-graph on n vertices is a balanced blow-up of the complete 3-graph on 5 vertices. Our proof uses the stability method and a result on lagrangians of intersecting families that has independent interest.