arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0812.1624math.OCcs.NAmath.AGmath.NA
收藏

数值域的半定几何

Semidefinite geometry of the numerical range

LAAS-CNRS, University of Toulouse, France(图卢兹大学 LAAS-CNRS);Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic(布拉格捷克理工大学电气工程学院)

Didier Henrion

AI总结:

通过半定锥的仿射截面与投影,建立数值域与线性矩阵不等式可行集的对偶关系,并利用代数曲线刻画凸包,揭示半定规划对偶性。

摘要:

通过半正定矩阵锥(简称半定锥)从几何角度研究矩阵的数值域。特别地,证明了二维线性矩阵不等式(LMI)的可行集(半定锥的仿射截面)总是与某个矩阵的数值域对偶,因此数值域是半定锥的仿射投影。原集与对偶集也可视为显式代数平面曲线分量的凸包。几个数值例子说明了代数、几何与半定规划对偶性之间的相互作用。最后,利用这些技术重新审视统计学中关于正态分布向量中二次型独立性的一个定理。

英文摘要:

The numerical range of a matrix is studied geometrically via the cone of positive semidefinite matrices (or semidefinite cone for short). In particular it is shown that the feasible set of a two-dimensional linear matrix inequality (LMI), an affine section of the semidefinite cone, is always dual to the numerical range of a matrix, which is therefore an affine projection of the semidefinite cone. Both primal and dual sets can also be viewed as convex hulls of explicit algebraic plane curve components. Several numerical examples illustrate this interplay between algebra, geometry and semidefinite programming duality. Finally, these techniques are used to revisit a theorem in statistics on the independence of quadratic forms in a normally distributed vector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑