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approximation by operators

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  • Approximation property — In mathematics, a Banach space is said to have the approximation property (AP in short), if every compact operator is a limit of finite rank operators. The converse is always true.Every Hilbert space has this property. There are, however, Banach… …   Wikipedia

  • Approximation sigma — En mathématiques, l’approximation sigma, imaginée par Cornelius Lanczos, est une méthode de fenêtrage qui permet d ajuster une série de Fourier pour éliminer le phénomène de Gibbs qui pourrait survenir aux discontinuités. Principe Une… …   Wikipédia en Français

  • Born-Oppenheimer approximation — In quantum chemistry, the computation of the energy and wavefunction of an average size molecule is a formidable task that is alleviated by the Born Oppenheimer (BO) approximation. For instance the benzene molecule consists of 12 nuclei and 42… …   Wikipedia

  • Constructive Approximation —   Abbreviated title (ISO) Constr. Approx. Discipline mathematics …   Wikipedia

  • Entropiezahl — Entropiezahlen sind in der Funktionalanalysis Kennzahlen von stetigen linearen Operatoren. Das Konzept basiert auf dem Begriff der Epsilon Entropie. Inhaltsverzeichnis 1 Definition 1.1 Äußere Entropiezahlen 1.2 Innere Entropiezahlen …   Deutsch Wikipedia

  • Entropiezahlen — sind in der Funktionalanalysis Kennzahlen von stetigen linearen Operatoren. Das Konzept basiert auf dem Begriff der Epsilon Entropie. Inhaltsverzeichnis 1 Definition 1.1 Äußere Entropiezahlen 1.2 Innere Entropiezahlen 1.3 …   Deutsch Wikipedia

  • Overcompleteness — A system in a Banach space X is complete if every element in X can be approximated arbitrarily well in norm by finite linear combinations of elements in .[1] Such a complete system is overcomplete if removal of a ϕj from the system results in a… …   Wikipedia

  • Per Enflo — Born 1944 Stockholm, Sweden …   Wikipedia

  • Singular value decomposition — Visualization of the SVD of a 2 dimensional, real shearing matrix M. First, we see the unit disc in blue together with the two canonical unit vectors. We then see the action of M, which distorts the disk to an ellipse. The SVD decomposes M into… …   Wikipedia

  • Hilbert space — For the Hilbert space filling curve, see Hilbert curve. Hilbert spaces can be used to study the harmonics of vibrating strings. The mathematical concept of a Hilbert space, named after David Hilbert, generalizes the notion of Euclidean space. It… …   Wikipedia

  • List of numerical analysis topics — This is a list of numerical analysis topics, by Wikipedia page. Contents 1 General 2 Error 3 Elementary and special functions 4 Numerical linear algebra …   Wikipedia

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