point eikonal
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Eikonal equation — The eikonal equation is a non linear partial differential equation of the form: | abla u(x)|=F(x), xin Omega subject to u| {partial Omega}=0, where Omega is an open set in mathbb{R}^n with well behaved boundary, F(x) is a function with positive… … Wikipedia
Computation of radiowave attenuation in the atmosphere — One of the causes of attenuation of radio propagation is the absorption by the atmosphere. There are many well known facts on the phenomenon and qualitative treatments in textbooks.[1] A document published by the International Telecommunication… … Wikipedia
Monge cone — In the mathematical theory of partial differential equations (PDE), the Monge cone is a geometrical object associated with a first order equation. It is named for Gaspard Monge. In two dimensions, let be a PDE for an unknown real valued function… … Wikipedia
List of mathematics articles (E) — NOTOC E E₇ E (mathematical constant) E function E₈ lattice E₈ manifold E∞ operad E7½ E8 investigation tool Earley parser Early stopping Earnshaw s theorem Earth mover s distance East Journal on Approximations Eastern Arabic numerals Easton s… … Wikipedia
Fourier optics — is the study of classical optics using techniques involving Fourier transforms and can be seen as an extension of the Huygens Fresnel principle. The underlying theorem that light waves can be described as made up of sinusoidal waves, in a manner… … Wikipedia
Signed distance function — In mathematics and applications, the signed distance function of a set S in a metric space determines how close a given point x is to the boundary of S , with that function having positive values at points x inside S , it decreases in value as x… … Wikipedia
Mild-slope equation — Simulation of wave penetration involving diffraction and refraction into Tedious Creek, Maryland, using CGWAVE (which solves the mild slope equation). In fluid dynamics, the mild slope equation describes the combined effects of diffraction and… … Wikipedia
WKB approximation — In physics, the WKB (Wentzel–Kramers–Brillouin) approximation, also known as WKBJ (Wentzel–Kramers–Brillouin–Jeffreys) approximation, is the most familiar example of a semiclassical calculation in quantum mechanics in which the wavefunction is… … Wikipedia
General relativity — For a generally accessible and less technical introduction to the topic, see Introduction to general relativity. General relativity Introduction Mathematical formulation Resources … Wikipedia
Aberrations en optique des particules chargées — Les aberrations en optique des particules chargées sont l équivalent des aberrations en optique photonique. L étude des aberrations des lentilles électroniques est presque aussi vieille que le microscope électronique[1]. Il n y a pas de… … Wikipédia en Français
List of nonlinear partial differential equations — In mathematics and physics, nonlinear partial differential equations are (as their name suggests) partial differential equations with nonlinear terms. They describe many different physical systems, ranging from gravitation to fluid dynamics, and… … Wikipedia
