Triforce and corners
Triforce and corners
复制标题
三角力和角点
DOI:
10.1017/s0305004119000173
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发表时间:
2020
影响因子:
0.8
通讯作者:
ZHAO, YUFEI
中科院分区:
文献类型:
--
作者:
FOX, JACOB;SAH, ASHWIN;SAWHNEY, MEHTAAB;STONER, DAVID;ZHAO, YUFEI
May the triforce be the 3-uniform hypergraph on six vertices with edges {123′, 12′3, 1′23}. We show that the minimum triforce density in a 3-uniform hypergraph of edge density δ is δ4–o(1) but not O(δ4).Let M(δ) be the maximum number such that the following holds: for every ∊ > 0 and with n sufficiently large, if A ⊆ G × G with A ≥ δ|G|2, then there exists a nonzero “popular difference” d ∈ G such that the number of “corners” (x, y), (x + d, y), (x, y + d) ∈ A is at least (M(δ)–∊)|G|2. As a corollary via a recent result of Mandache, we conclude that M(δ) = δ4–o(1) and M(δ) = ω(δ4).On the other hand, for 0 < δ < 1/2 and sufficiently large N, there exists A ⊆ [N]3 with |A| ≥ δN3 such that for every d ≠ 0, the number of corners (x, y, z), (x + d, y, z), (x, y + d, z), (x, y, z + d) ∈ A is at most δc log(1/δ)N3. A similar bound holds in higher dimensions, or for any configuration with at least 5 points or affine dimension at least 3.
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DOI:
10.1007/s00039-005-0509-8
发表时间:
2003
期刊:
Geometric & Functional Analysis GAFA
影响因子:
--
作者:
B. Green
通讯作者:
B. Green
影响因子:
0.8
作者:
Matei Mandache
通讯作者:
Matei Mandache
DOI:
--
发表时间:
2014
期刊:
Forum of Mathematics, Sigma
影响因子:
--
作者:
T. Schoen;Olof Sisask
通讯作者:
Olof Sisask
影响因子:
0.9
作者:
Q. Chu
通讯作者:
Q. Chu
DOI:
--
发表时间:
2012
期刊:
European journal of combinatorics (Print)
影响因子:
--
作者:
J. Solymosi
通讯作者:
J. Solymosi