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Poisson kernel information


In mathematics, and specifically in potential theory, the Poisson kernel is an integral kernel, used for solving the two-dimensional Laplace equation, given Dirichlet boundary conditions on the unit disk. The kernel can be understood as the derivative of the Green's function for the Laplace equation. It is named for Siméon Poisson.

Poisson kernels commonly find applications in control theory and two-dimensional problems in electrostatics. In practice, the definition of Poisson kernels are often extended to n-dimensional problems.

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Poisson kernel

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In mathematics, and specifically in potential theory, the Poisson kernel is an integral kernel, used for solving the two-dimensional Laplace equation, given...

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Dirac delta function

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the delta function. The Poisson kernel is also closely related to the Cauchy distribution and Epanechnikov and Gaussian kernel functions. This semigroup...

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Poisson formula

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probability Poisson summation formula in Fourier analysis Poisson kernel in complex or harmonic analysis Poisson–Jensen formula in complex analysis This disambiguation...

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Integral transform

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two variables, that is called the kernel or nucleus of the transform. Some kernels have an associated inverse kernel K − 1 ( u , t ) {\displaystyle K^{-1}(u...

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Poisson point process

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independently of one another. The Poisson point process is also called a Poisson random measure, Poisson random point field and Poisson point field. When the process...

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Poisson wavelet

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are connected with the derivatives of the Poisson integral kernel. For each positive integer n the Poisson wavelet ψ n ( t ) {\displaystyle \psi _{n}(t)}...

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Hilbert transform

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{y}{(x-s)^{2}+y^{2}}}\;\mathrm {d} s} which is the convolution of f with the Poisson kernel P ( x , y ) = y π ( x 2 + y 2 ) {\displaystyle P(x,y)={\frac {y}{\pi...

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Cauchy distribution

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moment generating function. In mathematics, it is closely related to the Poisson kernel, which is the fundamental solution for the Laplace equation in the upper...

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Dirichlet problem

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and the solution to the problem (at least for the ball) using the Poisson kernel was known to Dirichlet (judging by his 1850 paper submitted to the Prussian...

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Hardy space

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can regain a (harmonic) function f on the unit disk by means of the Poisson kernel Pr: f ( r e i θ ) = 1 2 π ∫ 0 2 π P r ( θ − ϕ ) f ~ ( e i ϕ ) d ϕ ,...

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Hilbert space

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mathematics as well. For instance, in harmonic analysis the Poisson kernel is a reproducing kernel for the Hilbert space of square-integrable harmonic functions...

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Poisson boundary

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{\displaystyle K(z,\xi )={\frac {1-|z|^{2}}{|\xi -z|^{2}}}} is the Poisson kernel, holds for all z ∈ D {\displaystyle z\in \mathbb {D} } . One way to...

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Pi

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theory because it is the simplest Furstenberg measure, the classical Poisson kernel associated with a Brownian motion in a half-plane. Conjugate harmonic...

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Gegenbauer polynomials

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potential. Similar expressions are available for the expansion of the Poisson kernel in a ball (Stein & Weiss 1971). It follows that the quantities C k (...

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Zonal spherical harmonics

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measure. The zonal harmonics appear naturally as coefficients of the Poisson kernel for the unit ball in Rn: for x and y unit vectors, 1 ω n − 1 1 − r 2...

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Spherical harmonics

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The result can be proven analytically, using the properties of the Poisson kernel in the unit ball, or geometrically by applying a rotation to the vector...

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Gaussian function

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derive the following interesting[clarification needed] identity from the Poisson summation formula: ∑ k ∈ Z exp ⁡ ( − π ⋅ ( k c ) 2 ) = c ⋅ ∑ k ∈ Z exp...

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Poisson summation formula

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In mathematics, the Poisson summation formula is an equation that relates the Fourier series coefficients of the periodic summation of a function to values...

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Summability kernel

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|t|>\delta } . The Fejér kernel The Poisson kernel (continuous index) The Landau kernel The Dirichlet kernel is not a summability kernel, since it fails the...

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Landau kernel

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_{\delta }^{1}(1-t^{2})^{n}\,dt\leq (n+1)(1-r^{2})^{n}} Poisson Kernel Fejer Kernel Dirichlet Kernel Terras, Audrey (May 25, 2009). "Lecture 8. Dirac and...

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Furstenberg boundary

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}{\hat {f}}(e^{i\theta })P(z,e^{i\theta })\,d\theta } where P is the Poisson kernel. Any function f on the disc determines a function on the group of Möbius...

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Riesz transform

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for some polynomial P i j {\displaystyle P_{ij}} . Hilbert Transform Poisson kernel Riesz potential Strictly speaking, the definition (1) may only make...

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Positive harmonic function

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d\mu (\theta ).} This follows from the previous theorem because: the Poisson kernel is the real part of the integrand above the real part of a holomorphic...

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Singular integral operators of convolution type

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Lebesgue point of f. In fact the operator T1 − εHf has kernel Qr + i, where the conjugate Poisson kernel Qr is defined by Q r ( θ ) = 2 r sin ⁡ θ 1 − 2 r cos...

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