principle of partial variation

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• Variation of parameters — In mathematics, variation of parameters, also known as variation of constants, is a general method to solve inhomogeneous linear ordinary differential equations. It was developed by Joseph Louis Lagrange[citation needed]. For first order… …   Wikipedia

• Luke's variational principle — In fluid dynamics, Luke s variational principle is a Lagrangian variational description of the motion of surface waves on a fluid with a free surface, under the action of gravity. This principle is named after J.C. Luke, who published it in 1967 …   Wikipedia

• Hamilton's principle — In physics, Hamilton s principle is William Rowan Hamilton s formulation of the principle of stationary action (see that article for historical formulations). It states that the dynamics of a physical system is determined by a variational problem …   Wikipedia

• Pontryagin's minimum principle — Pontryagin s maximum (or minimum) principle is used in optimal control theory to find the best possible control for taking a dynamical system from one state to another, especially in the presence of constraints for the state or input controls. It …   Wikipedia

• Duhamel's principle — In mathematics, and more specifically in partial differential equations, Duhamel s principle is a general method for obtaining solutions to inhomogeneous linear evolution equations like the heat equation, wave equation, and vibrating plate… …   Wikipedia

• Bernoulli's principle — This article is about Bernoulli s principle and Bernoulli s equation in fluid dynamics. For Bernoulli s Theorem (probability), see Law of large numbers. For an unrelated topic in ordinary differential equations, see Bernoulli differential… …   Wikipedia

• Maupertuis' principle — In classical mechanics, Maupertuis principle (named after Pierre Louis Maupertuis) is an integral equation that determines the path followed by a physical system without specifying the time parameterization of that path. It is a special case of… …   Wikipedia

• Superposition principle — In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems,: The net response at a given place and time caused by two or more stimuli is the sum of the responses which… …   Wikipedia

• Anthropic principle — In astrophysics and cosmology, the anthropic principle is the philosophical argument that observations of the physical Universe must be compatible with the conscious life that observes it. Some proponents of the argument reason that it explains… …   Wikipedia

• Competitive exclusion principle — In ecology, the competitive exclusion principle,[1] sometimes referred to as Gause s law of competitive exclusion or just Gause s law,[2] is a proposition which states that two species competing for the same resources cannot coexist if other… …   Wikipedia

• MUSIC — This article is arranged according to the following outline: introduction written sources of direct and circumstantial evidence the material relics and iconography notated sources oral tradition archives and important collections of jewish music… …   Encyclopedia of Judaism