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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 that operates on a Banach space (a fundamental concept of functional analysis) consists of all scalars such that the operator does not have a bounded inverse on . The spectrum has a standard decomposition into three parts: * a point spectrum, consisting of the eigenvalues of * a continuous spectrum, consisting of the scalars that are not eigenvalues but make the range of 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 ==
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