On the rank of a random binary matrix

On the rank of a random binary matrix
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关于随机二元矩阵的秩

DOI:
10.1137/1.9781611975482.58
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发表时间:
2019
期刊:
Proceedings of the annual ACM-SIAM Symposium on Discrete Algorithms
影响因子:
--
通讯作者:
Pegden, Wesley
Pegden, Wesley
中科院分区:
--
文献类型:
--
作者:
Cooper, Colin;Frieze, Alan;Pegden, Wesley

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我们研究了随机n×mmatrixAn,m;k的秩次,其中每列有来自GF(2)的条目,且精确地yk个单位条目,其他条目为零。列是从所有(Nk)列的集合中独立且均匀地随机选择的.我们得到了作为列数目fc,n,k的函数的秩渐近正确的估计,其中=Cn/k.矩阵An,m;k形成了Ak-均匀随机超图H的点-边关联矩阵.Fan,m;k的等级可以表示如下。设|C2|为2-核的顶点数,|E(C2)|为边数。设m*是|C2|=|E(C2)|的m值。然后是W.HP。形式<m*Fan,m;k与m渐近,形式≥m*该秩渐近于-|E(C2)|+|C2|。此外,指定i.i.d.U[0,1]权重xi,i∊1,2,…MTO列,并定义一组列的权重SasX(S)=∑j∊SXj。将基准定义为一组n-1(K)个线性独立的柱。我们得到了最小权基的渐近正确估计。这推广了Frieze[关于随机最小生成树问题的值,离散应用数学,(1985年)]的著名结果,即,当Fork=2时,最小权重生成树的预期长度趋于ζ(3)∼1.202。
We study the rank of a randomn×mmatrixAn, m; kwith entries fromGF(2), and exactlykunit entries in each column, the other entries being zero. The columns are chosen independently and uniformly at random from the set of all (nk) such columns.We obtain an asymptotically correct estimate for the rank as a function of the number of columnsmin terms ofc, n, k, and wherem=cn/k.The matrixAn, m; kforms the vertex-edge incidence matrix of ak-uniform random hypergraphH. The rank ofAn, m; kcan be expressed as follows. Let |C2| be the number of vertices of the 2-core ofH, and |E(C2)| the number of edges. Letm*be the value ofmfor which |C2| = |E(C2)|. Then w.h.p. form<m* the rank ofAn, m; kis asymptotic to m, and form≥m* the rank is asymptotic tom– |E(C2)| + |C2|.In addition, assign i.i.d.U[0, 1] weightsXi,i∊ 1, 2, …mto the columns, and define the weight of a set of columnsSasX(S) = ∑j∊SXj. Define a basis as a set ofn– 1 (keven) linearly independent columns. We obtain an asymptotically correct estimate for the minimum weight basis. This generalises the well-known result of Frieze [On the value of a random minimum spanning tree problem, Discrete Applied Mathematics, (1985)] that, fork= 2, the expected length of a minimum weight spanning tree tends to ζ(3) ∼ 1.202.
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DOI: --
发表时间: 2019
期刊: Random structures algorithms
影响因子: --
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