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Lists of mathematics topics
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====Dynamical systems and differential equations==== [[File:Limitcycle.svg|right|200px|thumb|Phase portrait of a continuous-time dynamical system, the [[Van der Pol oscillator]].]] A [[differential equation]] is an equation involving an unknown function and its derivatives. In a [[dynamical system]], a fixed rule describes the time dependence of a point in a geometrical space. The mathematical models used to describe the swinging of a clock pendulum, the flow of water in a pipe, or the number of fish each spring in a lake are examples of dynamical systems. * [[List of dynamical systems and differential equations topics]] * [[List of nonlinear partial differential equations]] * [[List of partial differential equation topics]]
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