• Thumbnail for Poisson's equation
    Poisson's equation is an elliptic partial differential equation of broad utility in theoretical physics. For example, the solution to Poisson's equation...
    17 KB (2,371 words) - 02:04, 5 June 2025
  • Thumbnail for Siméon Denis Poisson
    runs over the whole space. Poisson's equation was first published in the Bulletin de la société philomatique (1813). Poisson's two most important memoirs...
    35 KB (4,498 words) - 02:20, 26 May 2025
  • In mathematics, the discrete Poisson equation is the finite difference analog of the Poisson equation. In it, the discrete Laplace operator takes the place...
    11 KB (1,963 words) - 14:21, 13 May 2025
  • The Poisson–Boltzmann equation describes the distribution of the electric potential in solution in the direction normal to a charged surface. This distribution...
    27 KB (4,186 words) - 21:51, 3 June 2025
  • zero, the equation reduces to Poisson's equation. Therefore, when λ is very small, the solution approaches that of the unscreened Poisson equation, which...
    8 KB (1,335 words) - 14:26, 29 May 2025
  • Thumbnail for Laplace's equation
    \Delta f=h} This is called Poisson's equation, a generalization of Laplace's equation. Laplace's equation and Poisson's equation are the simplest examples...
    33 KB (5,075 words) - 15:19, 13 April 2025
  • The uniqueness theorem for Poisson's equation states that, for a large class of boundary conditions, the equation may have many solutions, but the gradient...
    6 KB (900 words) - 09:52, 1 April 2025
  • Schrödinger–Newton equation, sometimes referred to as the Newton–Schrödinger or Schrödinger–Poisson equation, is a nonlinear modification of the Schrödinger equation with...
    25 KB (3,508 words) - 11:16, 27 November 2023
  • Weak formulation (category Partial differential equations)
    {\displaystyle a(u,v)=\mathbf {v} ^{T}\mathbf {A} \mathbf {u} .} To solve Poisson's equation − ∇ 2 u = f , {\displaystyle -\nabla ^{2}u=f,} on a domain Ω ⊂ R d...
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  • time. The canonical examples of elliptic PDEs are Laplace's Equation and Poisson's Equation. Elliptic PDEs are also important in pure mathematics, where...
    18 KB (2,591 words) - 12:14, 13 May 2025
  • .} Then the differential form of Gauss's law for gravity becomes Poisson's equation: ∇ 2 ϕ = 4 π G ρ . {\displaystyle \nabla ^{2}\phi =4\pi G\rho .} This...
    15 KB (2,228 words) - 22:32, 26 April 2025
  • equation which governs the curvature obtained by the band edges in the space charge region, i.e. the band bending phenomenon, is Poisson’s equation,...
    19 KB (2,685 words) - 21:54, 3 June 2025
  • Potential theory (category Partial differential equations)
    Poisson's equation—or in the vacuum, Laplace's equation. There is considerable overlap between potential theory and the theory of Poisson's equation to...
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  • Thumbnail for Lane–Emden equation
    In astrophysics, the Lane–Emden equation is a dimensionless form of Poisson's equation for the gravitational potential of a Newtonian self-gravitating...
    20 KB (3,449 words) - 15:32, 24 May 2025
  • Thumbnail for Euler equations (fluid dynamics)
    velocity together with an elliptic Poisson's equation for the pressure. On the other hand, the compressible Euler equations form a quasilinear hyperbolic system...
    79 KB (13,150 words) - 01:53, 26 May 2025
  • manifold M {\displaystyle M} . In Newton's theory of gravitation, Poisson's equation reads Δ U = 4 π G ρ {\displaystyle \Delta U=4\pi G\rho \,} where U...
    10 KB (1,414 words) - 18:34, 6 February 2025
  • step is to specify the electrostatic potential for ion j by means of Poisson's equation ∇ 2 ψ j ( r ) = − 1 ε 0 ε r ρ j ( r ) {\displaystyle \nabla ^{2}\psi...
    43 KB (7,543 words) - 20:05, 19 March 2025
  • Laplace operator (category Elliptic partial differential equations)
    differential equations describing physical phenomena. Poisson's equation describes electric and gravitational potentials; the diffusion equation describes...
    30 KB (4,682 words) - 03:20, 8 May 2025
  • Thumbnail for Electrostatics
    relationship is a form of Poisson's equation. In the absence of unpaired electric charge, the equation becomes Laplace's equation: ∇ 2 ϕ = 0 , {\displaystyle...
    19 KB (2,615 words) - 22:01, 5 June 2025
  • Quebec Poisson distribution, a discrete probability distribution named after Siméon Denis Poisson Poisson's equation, a partial differential equation named...
    852 bytes (141 words) - 07:12, 12 January 2023
  • Functional equation Functional equation (L-function) Constitutive equation Laws of science Defining equation (physical chemistry) List of equations in classical...
    5 KB (103 words) - 09:21, 8 August 2024
  • In mathematics, the Euler–Poisson–Darboux(EPD) equation is the partial differential equation u x , y + N ( u x + u y ) x + y = 0. {\displaystyle u_{x,y}+{\frac...
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  • Thumbnail for Poisson's ratio
    modulus is much higher than the shear modulus, Poisson's ratio is near 0.5. For open-cell polymer foams, Poisson's ratio is near zero, since the cells tend...
    33 KB (4,417 words) - 00:28, 2 April 2025
  • Thumbnail for Electric-field screening
    respectively. The charge density and electric potential are related by Poisson's equation, which gives − ∇ 2 [ Δ ϕ ( r ) ] = 1 ε 0 [ Q δ ( r ) − e Δ ρ ( r )...
    16 KB (2,291 words) - 22:11, 2 June 2025
  • construct a new image by integrating the gradient, which requires solving Poisson's equation. Processing images in the gradient domain is a two-step process. The...
    7 KB (896 words) - 14:11, 16 May 2024
  • Korteweg–de Vries equation Modified KdV–Burgers equation Maxwell's equations Navier–Stokes equations Poisson's equation Primitive equations (hydrodynamics)...
    2 KB (157 words) - 18:19, 14 March 2022
  • function arises in systems that can be described by Poisson's equation, a partial differential equation (PDE) of the form ∇ 2 u ( x ) = f ( x ) {\displaystyle...
    11 KB (1,910 words) - 01:17, 15 August 2024
  • The Nernst–Planck equation is a conservation of mass equation used to describe the motion of a charged chemical species in a fluid medium. It extends...
    5 KB (697 words) - 00:38, 24 May 2025
  • Dirichlet's principle (category Partial differential equations)
    solution to Poisson's equation. Dirichlet's principle states that, if the function u ( x ) {\displaystyle u(x)} is the solution to Poisson's equation Δ u +...
    4 KB (573 words) - 16:59, 28 February 2025
  • \dots ,y^{(n)}(x))dx,} then y {\displaystyle y} must satisfy the Euler–Poisson equation, ∂ f ∂ y − d d x ( ∂ f ∂ y ′ ) + ⋯ + ( − 1 ) n d n d x n [ ∂ f ∂ y...
    58 KB (9,530 words) - 08:36, 5 June 2025