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arXiv 1507.08463math.OC
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多项式横坐标的半定逼近

Semidefinite approximations of the polynomial abscissa

Roxana Heß, Didier Henrion, Jean-Bernard Lasserre, Tien Son Pham

摘要:

给定一个一元多项式,它的横坐标是它的根的最大实部。当控制线性微分方程时,横坐标自然出现。作为多项式系数的函数,横坐标是H{<$}lder连续的,而不是一般的局部Lipschitz,这是设计和优化控制律的数值困难的来源。在本文中,我们提出了简单的近似的横坐标的多项式的固定程度,因此控制复杂性。我们的近似计算的层次有限维凸半定规划问题。当它们的次数趋于无穷大时,多项式逼近按范数收敛于abcissa,或者从上或者从下。

英文摘要:

Given a univariate polynomial, its abscissa is the maximum real part of its roots. The abscissa arises naturally when controlling linear differential equations. As a function of the polynomial coefficients, the abscissa is H{ö}lder continuous, and not locally Lipschitz in general, which is a source of numerical difficulties for designing and optimizing control laws. In this paper we propose simple approximations of the abscissa given by polynomials of fixed degree, and hence controlled complexity. Our approximations are computed by a hierarchy of finite-dimensional convex semidefinite programming problems. When their degree tends to infinity, the polynomial approximations converge in norm to the abcissa, either from above or from below.

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。

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