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Irreducible Width 2 Posets of Linear Discrepancy 3

机译:不可约宽度2线性差异的点集3

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The linear discrepancy of a poset P is the least k such that there is a linear extension L of P such that if x and y are incomparable in P, then ∣h_L(x) - h_L(y)∣≤ k, where h_L(x) is the height of x in L. Tannenbaum, Trenk, and Fishburn characterized the posets of linear discrepancy 1 as the semiorders of width 2 and posed the problem for characterizing the posets of linear discrepancy 2. Howard et al. (Order 24:139-153, 2007) showed that this problem is equivalent to finding all posets of linear discrepancy 3 such that the removal of any point reduces the linear discrepancy. In this paper we determine all of these minimal posets of linear discrepancy 3 that have width 2. We do so by showing that, when removing a specific maximal point in a minimal linear discrepancy 3 poset, there is a unique linear extension that witnesses linear discrepancy 2.
机译:位姿P的线性差异至少为k,从而存在P的线性扩展L,使得如果x和y在P中不可比,则∣h_L(x)-h_L(y)∣≤ k,其中h_L( Tannenbaum,Trunk和Fishburn将线性差异1的样态描述为宽度2的半数,并提出了表征线性差异2的样态的问题。 (第24:139-153号命令,2007年)表明,此问题等同于找到线性差异3的所有样态,以便去除任何点都会减小线性差异。在本文中,我们确定所有具有宽度2的线性差异3的所有最小姿态。我们通过显示出,当在最小线性差异3姿态中移除特定的最大点时,有一个唯一的线性扩展见证了线性差异2。

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