Kakeya-type sets in finite vector spaces

Kakeya-type sets in finite vector spaces
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有限向量空间中的挂屋型集合

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发表时间:
2010
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通讯作者:
M. Sudan
M. Sudan
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作者:
Swastik Kopparty;V. Lev;Shubhangi Saraf;M. Sudan

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对于有限向量空间V和非负整数r≤dim V,我们估计V的子集的最小可能大小,该子集包含每个r维子空间的平移。特别地,我们证明了如果K <$V是具有此性质的最小子集,n表示V的维数,q是基础域的大小,则对于r有界且r<n≤rqr−1,我们有|V K| =Θ(nqn−r+1);这改进了先前已知的边界|V K| =Ω(qn−r+1),|V K|时间复杂度为O(n2 qn −r+1)。
For a finite vector space V and a nonnegative integer r≤dim V, we estimate the smallest possible size of a subset of V, containing a translate of every r-dimensional subspace. In particular, we show that if K⊆V is the smallest subset with this property, n denotes the dimension of V, and q is the size of the underlying field, then for r bounded and r<n≤rqr−1, we have |V∖K|=Θ(nqn−r+1); this improves the previously known bounds |V∖K|=Ω(qn−r+1) and |V∖K|=O(n2qn−r+1).