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arXiv 2106.05650math.OC
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线性算子的标度相对图

The Scaled Relative Graph of a Linear Operator

Richard Pates

摘要:

算子的标度相对图(SRG)是复平面的子集。它捕捉了几个显着的功能,如收缩的运营商,并可以用来揭示几何性质的许多不等式为基础的参数中使用的收敛分析的不动点迭代。本文证明了一个线性算子的SRG可以由一个密切相关的线性算子的数值域确定。此外,我们证明了一个线性算子的SRG具有一系列的谱和凸性质,并满足类似的Hildebrant定理。

英文摘要:

The scaled relative graph (SRG) of an operator is a subset of the complex plane. It captures several salient features of an operator, such as contractiveness, and can be used to reveal the geometric nature of many of the inequality based arguments used in the convergence analyses of fixed point iterations. In this paper we show that the SRG of a linear operator can be determined from the numerical range of a closely related linear operator. Furthermore we demonstrate that the SRG of a linear operator has a range of spectral and convexity properties, and satisfies an analogue of Hildebrant's theorem.

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