discrete representation

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• Representation d'etat — Représentation d état En automatique, une représentation d état permet de modéliser un système dynamique sous forme matricielle en utilisant des variables d état. On se place alors dans un espace d état. Cette représentation, qui peut être… …   Wikipédia en Français

• représentation — [ r(ə)prezɑ̃tasjɔ̃ ] n. f. • 1250; lat. repræsentatio, de repræsentare I ♦ Action de mettre devant les yeux ou devant l esprit de qqn. 1 ♦ Vx ou dr. Production, présentation. Représentation d acte (pouvant servir de titre ou de preuve). ⇒… …   Encyclopédie Universelle

• Discrete series representation — In mathematics, a discrete series representation is an irreducible unitary representation of a locally compact topological group G that is a subrepresentation of the left regular representation of G on L²(G). In the Plancherel measure, such… …   Wikipedia

• Discrete Fourier transform — Fourier transforms Continuous Fourier transform Fourier series Discrete Fourier transform Discrete time Fourier transform Related transforms In mathematics, the discrete Fourier transform (DFT) is a specific kind of discrete transform, used in… …   Wikipedia

• Representation theory of SL2(R) — In mathematics, the main results concerning irreducible unitary representations of the Lie group SL2(R) are due to Gelfand and Naimark (1946), V. Bargmann (1947), and Harish Chandra (1952). Structure of the complexified Lie algebra We choose a… …   Wikipedia

• Representation theory of finite groups — In mathematics, representation theory is a technique for analyzing abstract groups in terms of groups of linear transformations. See the article on group representations for an introduction. This article discusses the representation theory of… …   Wikipedia

• Représentation d'état — En automatique, une représentation d état permet de modéliser un système dynamique sous forme matricielle en utilisant des variables d état. On se place alors dans un espace d état. Cette représentation, qui peut être linéaire ou non linéaire,… …   Wikipédia en Français

• Discrete-time Fourier transform — In mathematics, the discrete time Fourier transform (DTFT) is one of the specific forms of Fourier analysis. As such, it transforms one function into another, which is called the frequency domain representation, or simply the DTFT , of the… …   Wikipedia

• Representation theory — This article is about the theory of representations of algebraic structures by linear transformations and matrices. For the more general notion of representations throughout mathematics, see representation (mathematics). Representation theory is… …   Wikipedia

• Discrete Fourier series — A Fourier series is a representation of a function in terms of a summation of an infinite number of harmonically related sinusoids with different amplitudes and phases. The amplitude and phase of a sinusoid can be combined into a single complex… …   Wikipedia

• Discrete wavelet transform — An example of the 2D discrete wavelet transform that is used in JPEG2000. The original image is high pass filtered, yielding the three large images, each describing local changes in brightness (details) in the original image. It is then low pass… …   Wikipedia