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Decomposition of spectrum (functional analysis) : ウィキペディア英語版
Decomposition of spectrum (functional analysis)
The spectrum of a linear operator T that operates on a Banach space X (a fundamental concept of functional analysis) consists of all scalars \lambda such that the operator T-\lambda does not have a bounded inverse on X. The spectrum has a standard decomposition into three parts:
* a point spectrum, consisting of the eigenvalues of T
* a continuous spectrum, consisting of the scalars that are not eigenvalues but make the range of T-\lambda a proper dense subset of the space;
* a residual spectrum, consisting of all other scalars in the spectrum
This decomposition is relevant to the study of differential equations, and has applications to many branches of science and engineering. A well-known example from quantum mechanics is the explanation for the discrete spectral lines and the continuous band in the light emitted by excited atoms of hydrogen.
== Definitions ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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