Perturbation
Encyclopedia
Perturbation or perturb may refer to any of numerous concepts in several fields:
- Perturbation theoryPerturbation theoryPerturbation theory comprises mathematical methods that are used to find an approximate solution to a problem which cannot be solved exactly, by starting from the exact solution of a related problem...
, mathematical methods that give approximate solutions to problems that cannot be solved exactly - Perturbation (geology), changes in the nature of alluvial deposits over time
- Perturbation (astronomy)Perturbation (astronomy)Perturbation is a term used in astronomy in connection with descriptions of the complex motion of a massive body which is subject to appreciable gravitational effects from more than one other massive body....
, alterations to an object's orbit e.g. caused by gravitational interactions with other bodies - Perturbation theory (quantum mechanics)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 mathematical solution is known, and add an...
, a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one - Perturbation (biology)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...
, an alteration of the function of a biological system, induced by external or internal mechanisms - Perturbation (transport), operation of a transport system outside of timetable such that delays in arrival and departure from defined locations are present.
- Perturbation functionPerturbation functionIn mathematical optimization, the perturbation function is any function which relates to primal and dual problems. The name comes from the fact that any such function defines a perturbation of the initial problem...
, mathematical function which relates the primal and dual problemDual problemIn constrained optimization, it is often possible to convert the primal problem to a dual form, which is termed a dual problem. Usually dual problem refers to the Lagrangian dual problem but other dual problems are used, for example, the Wolfe dual problem and the Fenchel dual problem...
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