Toeplitz operators in several complex variables

Toeplitz operators in several complex variables
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DOI:
10.1016/0022-1236(77)90020-9
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发表时间:
1977-12
影响因子:
1.7
通讯作者:
A. Davie;N. Jewell
A. Davie;N. Jewell
中科院分区:
数学1区
文献类型:
--
作者:
A. Davie;N. Jewell

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设S是Cn中的单位球面。我们研究了S上Toeplitz算子的性质,即,算子T φf=P(φf),其中φ <$L∞(S),P表示L ~ 2(S)在H ~ 2(S)上的投影.本文的目的是确定广泛的单变量理论在更高维度中的有效性。建立了T φ的谱包含定理,即T φ的谱包含φ的本质值域,并利用算子方程得到了H 2(S)上算子中Toeplitz算子的一个特征.特别注意φ <$H∞(S)+C(S)的情形,其中C(S)表示S上的连续函数代数.最后,我们描述了一类Toeplitz运营商提供反例,特别是Widom的定理的连通性的频谱失败时,n> 1。
LetSbe the unit sphere in Cn. We investigate the properties of Toeplitz operators onS, i.e., operators of the formTφf=P(φf) whereφϵL∞(S) andPdenotes the projection ofL2(S) ontoH2(S). The aim of this paper is to determine how far the extensive one-variable theory remains valid in higher dimensions. We establish the spectral inclusion theorem, that the spectrum ofTφcontains the essential range of φ, and obtain a characterization of the Toeplitz operators among operators onH2(S) by an operator equation. Particular attention is paid to the case where φ ϵH∞(S) +C(S) whereC(S) denotes the algebra of continuous functions on S. Finally we describe a class of Toeplitz operators useful for providing counterexamples—in particular, Widom's theorem on the connectedness of the spectrum fails whenn> 1.