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arXiv 1902.11087math.SP
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无界自伴算子和Schr dinger算子的可解性复杂性指数

On The Solvability Complexity Index for Unbounded Selfadjoint Operators and Schrödinger Operators

Frank Rösler

摘要:

研究了可分希尔伯特空间上无界自伴算子及其扰动的可解性复杂性指数。特别地,我们证明了,如果自伴算子的扩展本质谱是凸的,则计算其谱的SCI等于1。然后将这个结果推广到此类算子的相对紧扰动,并应用于具有紧支撑(复值)势的薛定谔算子,在这种情况下也得到SCI=1。

英文摘要:

We study the solvability complexity index (SCI) for unbounded selfadjoint operators on separable Hilbert spaces and perturbations thereof. In particular, we show that if the extended essential spectrum of a selfadjoint operator is convex, then the SCI for computing its spectrum is equal to 1. This result is then extended to relatively compact perturbations of such operators and applied to Schrödinger operators with compactly supported (complex valued) potentials to obtain SCI=1 in this case, as well.

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