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arXiv 0801.4336math.OC
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定维参数化整数规划

Parametric Integer Programming in Fixed Dimension

Friedrich Eisenbrand, Gennady Shmonin

摘要:

考虑如下问题:给定一个有理矩阵$A \in \setQ^{m \times n}$和一个有理多面体$Q \subseteq\setR^{m+p}$,判定是否对所有向量$b \in \setR^m$,存在一个积分$z \in \setZ^p$使得$(b, z) \in Q$,线性不等式组$A x \leq b$有一个积分解.我们表明,存在一个算法,解决这个问题的多项式时间,如果$p$和$n$是固定的。这扩展了Kannan(1990)的结果,Kannan为除了$p$和$n$之外,$Q$的仿射维数固定的情况建立了这样的算法。作为这一结果的应用,我们描述了一个算法,以寻找整数规划$\max \{c x : A x \leq b, x \in \setZ^n \}$的最优值之间的最大差异及其线性规划松弛在所有右手边$b$,整数规划是可行的。如果$n$是固定的,则该算法是多项式的。这是Hoelten和Sturmfels(2003)最近结果的扩展,他们以标准形式给出了整数规划的算法。

英文摘要:

We consider the following problem: Given a rational matrix $A \in \setQ^{m \times n}$ and a rational polyhedron $Q \subseteq\setR^{m+p}$, decide if for all vectors $b \in \setR^m$, for which there exists an integral $z \in \setZ^p$ such that $(b, z) \in Q$, the system of linear inequalities $A x \leq b$ has an integral solution. We show that there exists an algorithm that solves this problem in polynomial time if $p$ and $n$ are fixed. This extends a result of Kannan (1990) who established such an algorithm for the case when, in addition to $p$ and $n$, the affine dimension of $Q$ is fixed. As an application of this result, we describe an algorithm to find the maximum difference between the optimum values of an integer program $\max \{c x : A x \leq b, x \in \setZ^n \}$ and its linear programming relaxation over all right-hand sides $b$, for which the integer program is feasible. The algorithm is polynomial if $n$ is fixed. This is an extension of a recent result of Hoşten and Sturmfels (2003) who presented such an algorithm for integer programs in standard form.

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