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On the f-vectors of cutsets in the Boolean lattice

机译:关于布尔格中割集的f向量

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摘要

A cutset in the poset 2([n]), of subsets of {1,...,n} ordered by inclusion, is a subset of 2[n] that intersects every maximal chain. Let 0 less than or equal to i less than or equal to n, contains at most alpha((n)(1)) subsets possible to find a cutset in 2([n]) that, for each 0 less than or equal to i less than or equal to n, contains at most alpha((n)(1))subsets of size i? Let alpha (n) be the greatest lower bound of all real numbers for which the answer is positive. In this note we prove the rather surprising fact that lim(n--> s) alpha (n) = 0. (C) 2001 Academic Press. [References: 13]
机译:{1,...,n}子集中包含的波姿2([n])中的割集是与每个最大链相交的2 [n]的子集。令0小于或等于i小于或等于n,最多包含alpha((n)(1))个子集,以找到2([n])中的割集,对于每一个小于或等于0的割集, i小于或等于n,最多包含大小为i的alpha((n)(1))子集?令alpha(n)是答案为肯定的所有实数的最大下限。在此注释中,我们证明了lim(n-> s)alpha(n)= 0的事实令人惊讶。(C)2001 Academic Press。 [参考:13]

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