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Approximation Guarantees for the Minimum Linear Arrangement Problem by Higher Eigenvalues

机译:高特征值最小线性排列问题的逼近保证。

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Given an undirected graph G = (V, E) and positive edge weights {w_e}_(e∈E), a linear arrangement is a permutation π : V → [n]. The value of the arrangement is val(G, π) := 1 Σ_(e={u,v}) w_e|π(u)-π(v)|. In the minimum linear arrangement problem (MLA), the goal is to find a linear arrangement π~* that achieves val(G,π~*) = MLA(G) := min_π val(G, π). In this paper, we show that for any ∈ > 0 and positive integer r, there is an O(n~(r/∈))-time randomized algorithm which, given a graph G, returns a permutation π such that val(G,π)≤(1+2/(1-∈)λ_(r+1)(L)) MLA(G)+O(log n~(1/2)Σ_(e∈E)w_e) with high probability. Here L is the normalized Laplacian of G and λ_r(L) is the r-th eigenvalue of L Our algorithm gives a constant factor approximation for regular graphs that are weak expanders.
机译:给定无向图G =(V,E)和正边权重{w_e} _(e∈E),线性排列是置换π:V→[n]。排列的值为val(G,π):= 1 / nΣ_(e = {u,v})w_e |π(u)-π(v)|。在最小线性排列问题(MLA)中,目标是找到一个线性排列π〜*,使其达到val(G,π〜*)= MLA(G):=min_πval(G,π)。在本文中,我们表明对于任何∈> 0和正整数r的情况,都有O(n〜(r /∈))时间随机算法,给定图G,它返回置换π,从而val(G ,π)≤(1 + 2 /(1-ε)λ_(r + 1)(L))MLA(G)+ O(log n / n〜(1/2)Σ_(e∈E)w_e)其中高概率。这里L是G的规范化拉普拉斯算子,而λ_r(L)是L的第r个特征值。对于弱扩张器的规则图,该算法给出了恒定因子近似值。

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