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  2. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]

  3. List of equations in quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/List_of_equations_in...

    Planck–Einstein equation and de Broglie wavelength relations. P = ( E/c, p) is the four-momentum, K = (ω/ c, k) is the four-wavevector, E = energy of particle. ω = 2π f is the angular frequency and frequency of the particle. ħ = h /2π are the Planck constants. c = speed of light. Schrödinger equation.

  4. Perturbation theory (quantum mechanics) - Wikipedia

    en.wikipedia.org/wiki/Perturbation_theory...

    In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak ...

  5. Korteweg–De Vries equation - Wikipedia

    en.wikipedia.org/wiki/Korteweg–De_Vries_equation

    Two-soliton solution to the KdV equation. In mathematics, the Korteweg–De Vries (KdV) equation is a partial differential equation (PDE) which serves as a mathematical model of waves on shallow water surfaces. It is particularly notable as the prototypical example of an integrable PDE and exhibits many of the expected behaviors for an ...

  6. Dispersion relation - Wikipedia

    en.wikipedia.org/wiki/Dispersion_relation

    In the physical sciences and electrical engineering, dispersion relations describe the effect of dispersion on the properties of waves in a medium. A dispersion relation relates the wavelength or wavenumber of a wave to its frequency. Given the dispersion relation, one can calculate the frequency-dependent phase velocity and group velocity of ...

  7. Smoothed-particle hydrodynamics - Wikipedia

    en.wikipedia.org/wiki/Smoothed-particle...

    See [1] for similar simulations. Smoothed-particle hydrodynamics ( SPH) is a computational method used for simulating the mechanics of continuum media, such as solid mechanics and fluid flows. It was developed by Gingold and Monaghan [2] and Lucy [3] in 1977, initially for astrophysical problems. It has been used in many fields of research ...

  8. Cauchy's equation - Wikipedia

    en.wikipedia.org/wiki/Cauchy's_equation

    The equation. The most general form of Cauchy's equation is = + + +,where n is the refractive index, λ is the wavelength, A, B, C, etc., are coefficients that can be determined for a material by fitting the equation to measured refractive indices at known wavelengths.

  9. Bethe–Salpeter equation - Wikipedia

    en.wikipedia.org/wiki/Bethe–Salpeter_equation

    The equation was first published in 1950 at the end of a paper by Yoichiro Nambu, but without derivation. A graphical representation of the Bethe–Salpeter equation, showing its recursive definition. Due to its generality and its application in many branches of theoretical physics, the Bethe–Salpeter equation appears in many different forms.

  10. Numerical solution of the convection–diffusion equation

    en.wikipedia.org/wiki/Numerical_solution_of_the...

    Unlike the conduction equation (a finite element solution is used), a numerical solution for the convection–diffusion equation has to deal with the convection part of the governing equation in addition to diffusion. When the Péclet number (Pe) exceeds a critical value, the spurious oscillations result in space and this problem is not unique ...

  11. Boussinesq approximation (buoyancy) - Wikipedia

    en.wikipedia.org/wiki/Boussinesq_approximation...

    The three numbered equations are the basic convection equations in the Boussinesq approximation. Advantages. The advantage of the approximation arises because when considering a flow of, say, warm and cold water of density ρ 1 and ρ 2 one needs only to consider a single density ρ: the difference Δρ = ρ 1 − ρ 2 is negligible.