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Continuity and Invariance of the Sacker-Sell Spectrum

机译:Sacker-Sell谱的连续性和不变性

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摘要

The Sacker-Sell (also called dichotomy or dynamical) spectrum is a fundamental concept in the geometric, as well as for a developing bifurcation theory of nonautonomous dynamical systems. In general, it behaves merely upper-semicontinuously and a perturbation theory is therefore delicate. This paper explores an operator-theoretical approach to obtain invariance and continuity conditions for both and its dynamically relevant subsets. Our criteria allow to avoid nonautonomous bifurcations due to collapsing spectral intervals and justify numerical approximation schemes for Sigma.
机译:Sacker-Sell(也称为二分法或动态)光谱是几何以及发展中的非自治动力系统分叉理论的基本概念。通常,它的行为仅是半连续的,因此扰动理论是微妙的。本文探索了一种算子理论方法来获取两者及其动态相关子集的不变性和连续性条件。我们的标准允许避免由于频谱间隔崩溃而引起的非自治分叉,并证明Sigma的数值近似方案合理。

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