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
中科院分区:
文献类型:
--
作者:
A. Davie;N. Jewell
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.