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arXiv 2008.08556math.COmath.DS
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2字母二次密度 Hales Jewett 猜想中的差集

Difference sets in Quadratic Density Hales Jewett conjecture with 2 letters

Aritro Pathak

AI总结:

本文研究2字母二次密度 Hales Jewett 猜想,证明稠密子集中存在差集为γ_1×γ_2的两个元素,并给出通配符集合受大小和形状限制的稠密向量子空间例子。

摘要:

具有2个字母的二次密度 Hales Jewett 猜想指出,当n足够大时,{0,1}^{n^{2}}的每个稠密子集都包含一条组合直线,其通配符集合具有γ×γ的形式,其中γ⊂{1,2,…,n}。我们以初等的定量方式证明,对于充分大的n,{0,1}^{n^{2}}的每个稠密子集都包含两个元素,使得它们不同的坐标点集合——我们称之为这两个元素的差集——具有γ_1×γ_2的形式,其中γ_1和γ_2都是{1,2,…,n}的非空子集。此外,我们给出了{0,1}^{n^{2}}的稠密向量子空间的若干非平凡例子;在每个例子中,所能得到的组合直线的通配符集合在大小和形状上都受到限制。

英文摘要:

The Quadratic Density Hales Jewett conjecture with $2$ letters states that for large enough $n$, every dense subset of $\{0,1\}^{n^{2}}$ contains a combinatorial line where the wildcard set is of the form $γ\times γ$ where $γ\subset \{1,2,\dots n\}$. We show in an elementary quantitative way that every dense subset of $\{0,1\}^{n^{2}}$, for sufficiently large $n$, contains two elements such that the set of coordinate points where they differ, which we term the difference set of these two elements, is of the form $γ_{1}\times γ_{2}$ where $γ_1, γ_2$ are both nonempty subsets of $\{1,2,\dots n\}$. Further we give several non-trivial examples of dense vector subspaces of $\{0,1\}^{n^{2}}$, where in each case the wildcard set of the combinatorial line that can be obtained has restrictions on its size and shape.

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