共查询到20条相似文献,搜索用时 984 毫秒
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V. G. Kurbatov 《Functional Analysis and Its Applications》2005,39(3):233-235
Let \(\mathbb{S}\) be a cone in ? n . A bounded linear operator T: L p (? n ) → L p (? n ) is said to be causal with respect to \(\mathbb{S}\) if the implication x(s) = 0 (s ε W ? \(\mathbb{S}\)) ? (Tx) (s) = 0 (s ε W ? \(\mathbb{S}\)) is valid for any x ε L p (? n ) and any open subset W\(\subseteq\) ? n . The set of all causal operators is a Banach algebra. We describe the spectrum of the operator in this algebra. Here x ranges in a Banach space \(\mathbb{E}\), the a n are bounded linear operators in \(\mathbb{E}\), and the function g ranges in the set of bounded operators in \(\mathbb{E}\).
相似文献
$(Tx)(t) = \sum\limits_{n = 1}^\infty {a_n x(t - t_n )} + \int {\mathbb{S}g(s)x(t - s)ds,} \quad t \in \mathbb{R}^n ,$
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本文讨论了算子A∈B(H)N为算子T∈B(H)的算子点谱的判定条件,特别得到:当T为亚正常算子时,A为T的算子点谱的判定条件,另外还得到kerτnT,A=kerτT,A成立的充分条件 相似文献
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The composition operators with closed rangc on H2(B
n) are characterized, and the Fredholmness of products of Toeplitz and composition operators discussed. Moreover, using composition
operators, the spectra of Toeplitz operators are studied.
Project supported by the National Natural Sciencc Foundation of China and the Postdoctoral Science Foundation of China. 相似文献
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Tadashi Ikuta Kazuhisa Shima 《Proceedings of the American Mathematical Society》2003,131(5):1471-1479
The purpose of this paper is to investigate the spectra of the Dirac operator . The local compactness of is shown under some assumption on . This method enables us to prove that if as , then and to give a significant sufficient condition that or has a purely discrete spectrum.
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J—自共轭微分算子谱的定性分析 总被引:6,自引:0,他引:6
本文对J-自共轭微分算子谱理论研究情况做一些概要性的介绍,第一部分简要回顾了J-自共轭微分算子理论研究的发展过程,第二,三部分介绍了J-自共轭微分算子的本质谱和离散谱定性分析的主要方法和结论;第四部分扼要叙述J-自共轭微分算子其它方面的一些工作,以及J-自共轭微分算子谱理论研究中尚待解决的问题。 相似文献
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This paper is concerned with the spectral properties of the unbounded upper triangular operator matrix with diagonal domain. Some sufficient and necessary conditions are given under which the essential spectrum, the Weyl spectrum and the Browder spectrum of such operator matrix, respectively, coincide with the union of the essential spectrum, the Weyl spectrum and the Browder spectrum of its diagonal entries. 相似文献
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研究了具指数函数系数的2n阶实系数微分算式生成的对称微分算子,利用算子的直和分解法及不等式估计得到此类微分算子谱是离散的充分条件. 相似文献
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将点谱划分为四个部分,得到上三角无穷维Hamilton算子的点谱σ_p(H)关于虚轴对称的充要条件.在此基础上,结合无穷维Hamilton算子的谱结构,得到无穷维Hamilton算子剩余谱的完全描述,从而实现了利用其内部算子刻画剩余谱. 相似文献
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FAN QIRONG 《数学年刊B辑(英文版)》1994,(3)
ON THE ESSENTIAL SPECTRUM OF PSEUDODIFFERENTIAL OPERATORS(II)ONTHEESSENTIALSPECTRUMOFPSEUDODIFFERENTIALOPERATORS(II)¥FANQIRON... 相似文献
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In this paper, we consider differential operators of 2nd-order
a[u]=(-1)k(ak(x)u(k)(x))(k), x∈(0, ∞)
whose coefficients ak(x) are restricted by powers of ex, and give conditions on the coefficients sufficient to ensure that the spectrum is discrete; next we formulate necessary and sufficient conditions for the discreteness of the spectrum of differential operators whose coefficients ak(x) may increase as eαkx as x→∞. 相似文献
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研究了一类无穷维Hamilton算子的近似点谱及本质谱.进而通过无穷维Hamilton算子内部元素的乘积的谱对整体谱进行了刻画,最后证明了结论的正确性. 相似文献
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采用泛函分析与不等式渐近估计的方法,根据系数的特点,给出了2n阶对称微分算子的自伴扩张的谱是离散的一个充分必要条件. 相似文献
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In the present paper, the method of guiding functions is applied to study the periodic problem for a differential inclusion with a causal multioperator. At first we consider the case when the multioperator is closed and convex-valued. Then the case of a non-convex-valued and lower semicontinuous right-hand part is considered. Thereafter, the theory is extended to the case of non-smooth guiding functions. 相似文献
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复系数2n阶微分算子的谱 总被引:4,自引:0,他引:4
本文研究了复系数2n阶微分算式(2.1)生成的J-自伴微分算子谱,对两类微分算子的本质谱,离散谱作了定性研究,得到了所生成微分算子本质谱的存在范围,以及所生成微分算子的谱是离散的充分条件. 相似文献
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有界线性算子的点谱和剩余谱分别可进-步细分为两类:σ_(p1),σ_(p2)和σ_(r1),σ_(r2).设H,K为无穷维可分的Hilbert空间,本文将对于给定的A ∈B (H),B ∈B(K),给出了缺项算子M_C=(AC/OB)关于分类后所得四种谱的扰动结果. 相似文献