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arXiv 2207.08992math.FA
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具有自守符号的复合算子的谱

Spectrum of a composition operator with automorphic symbol

Robert F. Allen, Thong M. Le, Matthew A. Pons

摘要:

我们给出了一个完整的表征谱的复合算子,诱导的自同构的开放单位磁盘,作用于一个家庭的Banach空间的解析函数,其中包括Bloch空间和BMOA。我们证明了对于抛物型和双曲型自同构,谱是单位圆。对于椭圆自同构的情形,谱是单位圆或单位圆的有限循环子群。

英文摘要:

We give a complete characterization of the spectrum of composition operators, induced by an automorphism of the open unit disk, acting on a family of Banach spaces of analytic functions that includes the Bloch space and BMOA. We show that for parabolic and hyperbolic automorphisms, the spectrum is the unit circle. For the case of elliptic automorphisms, the spectrum is either the unit circle or a finite cyclic subgroup of the unit circle.

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