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arXiv 2209.08039math.OC
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关于$6 \times 6$余正锥的结构

On the structure of the $6 \times 6$ copositive cone

Roland Hildebrand, Andrey Afonin

摘要:

在这项工作中,我们补充了描述的极端射线的$6 \times 6$共正锥与一些拓扑结构。在以前的文件中,我们分解成一个不相交的工会件代数簇的不同尺寸的这一锥的极端元素的集合。在本文中,我们将这种分类最近推出的组合特性称为扩展的最小零支撑集。我们确定那些重要的组成部分,即,其不嵌入其它组件的边界中。这使得在研究$6 \times 6$共正锥的不同性质时,可以大大减少必须考虑的情况的数量。作为应用,我们构造了一个不属于Parrilo内平方和松弛${\cal K}^{(1)}_6$的单位对角线的共正$6 \times 6$矩阵的例子.

英文摘要:

In this work we complement the description of the extreme rays of the $6 \times 6$ copositive cone with some topological structure. In a previous paper we decomposed the set of extreme elements of this cone into a disjoint union of pieces of algebraic varieties of different dimension. In this paper we link this classification to the recently introduced combinatorial characteristic called extended minimal zero support set. We determine those components which are essential, i.e., which are not embedded in the boundary of other components. This allows to drastically decrease the number of cases one has to consider when investigating different properties of the $6 \times 6$ copositive cone. As an application, we construct an example of a copositive $6 \times 6$ matrix with unit diagonal which does not belong to the Parrilo inner sum of squares relaxation ${\cal K}^{(1)}_6$.

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