Essential spectrum - Wikipedia

In mathematics, the essential spectrum of a bounded operator is a certain subset of its spectrum, defined by a condition of the type that says, roughly speaking, ...
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On the essential spectrum of a complete Riemannian manifold ...

H. DonnellySpectral Geometry for Certain Noncompact Riemannian Manifolds Math. ... H. Donnelly, Peter LiPure Point Spectrum and Negative Curvature for ...
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Decomposition of spectrum (functional analysis) - Wikipedia

The spectrum of a linear operator T {\displaystyle T} T that operates on a Banach space X ... In this case, λ is said to be in the point spectrum of T, denoted σp(T). T − λ is injective, and its .... The operator norm of T is the essential supremum of h.
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A characterization of some subsets of Schechter's essential ...

Our results are used to describe the essential approximate point spectrum and the essential defect spectrum of singular neutron transport operators in bounded  ...
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Difference between continuous and essential spectrum, examples?

Can anyone help me to understand the definitions of the continuous and essential spectra in simple terms and point out the difference on ...
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Absolute and essential spectra

point of the absolute spectrum is the branchpoint λbp = a − 1. The following schematic picture illustrates the various spectra. The essential spectrum is plotted in ...
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Spectrum

Discrete spectrum and essential spectrum · Point spectrum, continuous spectrum, and residual .... Point spectrum, continuous spectrum, and residual spectrum.
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On the essential spectrum of partial differential boundary problems

such a component Si, the specific point of the essential spectrum remains undisturbed ... Hence at every singular point x of our boundary operator we may define.
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ESSENTIAL SPECTRUM FOR A HILBERT SPACE OPERATOR

consider the essential spectrum of a Hilbert space operator. In the final ... Let T be a closed operator on H and let A be an isolated point of a(T). Then there is a ...
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On the essential spectrum of transport operators on L1‐spaces ...

35, 6199–6212 (1994)] the essential spectrum of transport operator was analyzed in ... K. Latrach, “Description of the real point spectrum for a class of neutron ...
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the point and the essential spectrum