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Sec 2.1 - studylib.net
Sec 2.1 - studylib.net

... two variables. A solution to an equation involving two variables consists of a pair of numbers, an x-value and a y-value for which the equation is true. Each pair of values is called an ordered pair because the order does matter. We use the notation  x, y  to represent an ordered pair. Notice that ...
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Advanced Mechanics 241, Spring 2008 Examination Questions and Problems Part I. Questions

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Noether's theorem



Noether's (first) theorem states that every differentiable symmetry of the action of a physical system has a corresponding conservation law. The theorem was proven by German mathematician Emmy Noether in 1915 and published in 1918. The action of a physical system is the integral over time of a Lagrangian function (which may or may not be an integral over space of a Lagrangian density function), from which the system's behavior can be determined by the principle of least action.Noether's theorem has become a fundamental tool of modern theoretical physics and the calculus of variations. A generalization of the seminal formulations on constants of motion in Lagrangian and Hamiltonian mechanics (developed in 1788 and 1833, respectively), it does not apply to systems that cannot be modeled with a Lagrangian alone (e.g. systems with a Rayleigh dissipation function). In particular, dissipative systems with continuous symmetries need not have a corresponding conservation law.
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