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arXiv 1107.4896math.CO
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强正则引理的Wowzer型下界

A Wowzer Type Lower Bound for the Strong Regularity Lemma

Subrahmanyam Kalyanasundaram, Asaf Shapira

摘要:

Szemeredi的正则性引理断言,人们可以将每个图划分为有界数目的拟随机二部图。然而,在某些应用中,人们希望对这些二部图的准随机性有很强的控制。阿隆、费舍尔、克里维列维奇和塞格迪得到了正则引理的一个强大的变体,它允许人们对这种准随机性的度量进行任意控制。然而,他们的证明只能保证产生一个分区,其中部分的数量由Wowzer函数给出,这是Tower函数的迭代版本。我们在这里表明,这种类型的界限是不可避免的,通过构建一个图H,与属性,即使一个人想要一个非常温和的控制准随机性的一个经常分区,那么任何这样的分区H必须有一些部分由Wowzer型函数。

英文摘要:

The regularity lemma of Szemeredi asserts that one can partition every graph into a bounded number of quasi-random bipartite graphs. In some applications however, one would like to have a strong control on how quasi-random these bipartite graphs are. Alon, Fischer, Krivelevich and Szegedy obtained a powerful variant of the regularity lemma, which allows one to have an arbitrary control on this measure of quasi-randomness. However, their proof only guaranteed to produce a partition where the number of parts is given by the Wowzer function, which is the iterated version of the Tower function. We show here that a bound of this type is unavoidable by constructing a graph H, with the property that even if one wants a very mild control on the quasi-randomness of a regular partition, then any such partition of H must have a number of parts given by a Wowzer-type function.

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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