Kakeya-type sets in finite vector spaces
Kakeya-type sets in finite vector spaces
复制标题
有限向量空间中的挂屋型集合
DOI:
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发表时间:
2010
期刊:
影响因子:
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通讯作者:
M. Sudan
中科院分区:
文献类型:
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作者:
Swastik Kopparty;V. Lev;Shubhangi Saraf;M. Sudan
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).