ellipticity
21Elliptic operator — In mathematics, an elliptic operator is one of the major types of differential operator. It can be defined on spaces of complex valued functions, or some more general function like objects. What is distinctive is that the coefficients of the… …
22Galaxy morphological classification — Artist s concept illustrating bulge no bulge spiral galaxies. Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies… …
23Monge–Ampère equation — In mathematics, a (real) Monge–Ampère equation is a nonlinear second order partial differential equation of special kind. A second order equation for the unknown function u of two variables x,y is of Monge–Ampère type if it is linear in the… …
24Harmonic generation — Perturbative Harmonic Generation Perturbative Harmonic Generation is a process where by laser lightof frequency ω and photon energy ħω can be usedto generate new frequencies of light. The newly generatedfrequencies are integer multiples of the… …
25Electro-gyration — The electrogyration effect is the spatial dispersion phenomenon, that consists in the change of optical activity (gyration) of crystals by a constant or time varying electric field. Being a spatial dispersion effect, the induced optical activity… …
26Generalized Gauss–Bonnet theorem — In mathematics, the generalized Gauss–Bonnet theorem (also called Chern–Gauss–Bonnet theorem) presents the Euler characteristic of a closed even dimensional Riemannian manifold as an integral of a certain polynomial derived from its curvature. It …
27Milankovich , Milutin — (1879–1958) Yugoslavian mathematician Milankovich was born at Dalj in Croatia and was educated at the Institute of Technology in Vienna, where he obtained his PhD in 1904. He then moved to the University of Belgrade, remaining there for the rest… …
28flattening — The ratio of the difference between the equatorial radius (major semi axis) and the polar radius (minor semi axis) of the earth to the equatorial radius. Also called compression. The flattening of the earth is the ellipticity of the spheroid, and …
29ellipsometer — ə̇ˌlipˈsäməd.ə(r), eˌ , ēˌ , ˌe(ˌ) noun Etymology: ellipse + o + meter : a polarimeter designed especially for determining the ellipticity of polarized light * * * /i lip som i teuhr, el ip , ee lip /, n. Optics. an instrument that measures the… …
30Algol — This article is about the star. For other uses, see Algol (disambiguation). Beta Persei A/B/C …
