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arXiv 1807.09618math.CO
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立方体顶点等周的稳定性

Stability for vertex isoperimetry in the cube

Peter Keevash, Eoin Long

摘要:

证明了Harper立方体顶点等周不等式的稳定性,证明了顶点边界接近最小值的立方体子集接近(广义)Hamming球.此外,我们得到了一个局部稳定性的结果,使一个尖锐的估计的顶点边界的距离,从一个球,所以我们的稳定性结果基本上是紧的(模的非单调现象)。我们也给出了类似的结果Kruskal-Katona定理和应用程序的新的稳定性版本的一些其他结果在极值组合。

英文摘要:

We prove a stability version of Harper's cube vertex isoperimetric inequality, showing that subsets of the cube with vertex boundary close to the minimum possible are close to (generalised) Hamming balls. Furthermore, we obtain a local stability result for ball-like sets that gives a sharp estimate for the vertex boundary in terms of the distance from a ball, and so our stability result is essentially tight (modulo a non-monotonicity phenomenon). We also give similar results for the Kruskal--Katona Theorem and applications to new stability versions of some other results in Extremal Combinatorics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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