small perturbation

См. также в других словарях:

• Perturbation theory — This article describes perturbation theory as a general mathematical method. For perturbation theory as applied to quantum mechanics, see perturbation theory (quantum mechanics). Perturbation theory comprises mathematical methods that are used to …   Wikipedia

• Perturbation theory (quantum mechanics) — 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 …   Wikipedia

• perturbation — [pʉr΄tər bā′shən] n. [ME < MFr perturbacion < L perturbatio] 1. a perturbing or being perturbed 2. something that perturbs; disturbance 3. Astron. a small change in an orbit caused by the attraction of another celestial body, other bodies,… …   English World dictionary

• perturbation — perturbational, adj. /perr teuhr bay sheuhn/, n. 1. the act of perturbing. 2. the state of being perturbed. 3. mental disquiet, disturbance, or agitation. 4. a cause of mental disquiet, disturbance, or agitation. 5. Astron. deviation of a… …   Universalium

• perturbation — [[t]pɜ͟ː(r)tə(r)be͟ɪʃ(ə)n[/t]] perturbations 1) N VAR A perturbation is a small change in the movement, quality, or behaviour of something, especially an unusual change. [TECHNICAL] ...perturbations in Jupiter s gravitational field. 2) N UNCOUNT… …   English dictionary

• perturbation theory — noun : any of various methods of calculating the approximate value of a complex function (as the energy of an electron in quantum mechanics) by first assuming that the dominant influence is the only factor and then making small corrections for… …   Useful english dictionary

• Perturbation (biology) — A perturbation of a biological system is an alteration of function, induced by external or internal mechanisms. Biological systems can be perturbed through a number of means. Examples include 1) Environmental stimuli (temperature changes, osmotic …   Wikipedia

• perturbation — noun a) Agitation; the state of being perturbed b) A small change in a physical system, or more broadly any definable system (such as a biological or economic system) …   Wiktionary

• perturbation — per|tur|ba|tion [ˌpə:təˈbeıʃən US ˌpə:rtər ] n 1.) [U and C] technical a small change in the movement, quality, or behaviour of something ▪ climatic perturbations 2.) [U] formal worry about something that has happened or will happen …   Dictionary of contemporary English

• perturbation — a small disturbing effect …   Mechanics glossary

• Singular perturbation — In mathematics, more precisely in perturbation theory, a singular perturbation problem is a problem containing a small parameter that cannot be approximated by setting the parameter value to zero. This is in contrast to regular perturbation… …   Wikipedia