Transcription of Nonlinear OrdinaryDifferentialEquations - Math User Home ...
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Nonlinear Ordinary Differential Equationsby Peter J. OlverUniversity of Minnesota1. notes are concerned with initial value problems for systems of ordinary dif-ferential equations. Here our emphasis will be on nonlinearphenomena and properties,particularly those with physical relevance. Finding a solution to a differential equationmay not be so important if that solution never appears in the physical model representedby the system, or is only realized in exceptional circumstances. Thus, equilibrium solu-tions, which correspond to configurations in which the physical system does not move,only occur in everyday situations if they are stable. An unstable equilibrium will not ap-pear in practice, since slight perturbations in the system or its physical surroundings willimmediately dislodge the system far away from course, very few Nonlinear systems can be solved explicitly, and so one must typ-ically rely on a numerical scheme to accurately approximatethe solution.
the extremely popular Runge–Kutta fourth order method, will be the subject of the final section of the chapter. However, numerical schemes do not always give accurate results, and we briefly discuss the class of stiff differential equations, which present a more serious challenge to numerical analysts.
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