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academic.csuohio.edu › dong_l › EEC510Linear vs. Non-linear Linear just means that the variable in an equation appears only with a power of one. So x is linear but x2 is non-linear. Also any function like cos(x) is non-linear. In math and physics, linear generally means "simple" and non-linear means "complicated". The theory for solving linear equations is very well developed because
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www.ams.org › S0002/9904/1955-09934-8NONLINEAR DIFFERENTIAL EQUATIONS EDMUND PINNEY 1. Introduction. A few nonlinear differential equations have known exact solutions, but many which are important in applications do not. Sometimes these equations may be linearized by an expansion process in which nonlinear terms are discarded. When nonlinear
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ww2.odu.edu › ~agodunov › teachingNonlinear Differential Equations and The Beauty of Chaos 2 Examples of nonlinear equations 2 ( ) kx t dt d x t m =− Simple harmonic oscillator (linear ODE) More complicated motion (nonlinear ODE) ( )(1 ()) 2 ( ) kx t x t dt d x t m =− −α Other examples: weather patters, the turbulent motion of fluids Most natural phenomena are ...
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www.math.uchicago.edu › ~may › REU2017A BRIEF OVERVIEW OF NONLINEAR ORDINARY DIFFERENTIAL EQUATIONS 5 Theorem 2.2. Let X0= AX be a 2-dimensional linear system. If det(A) 6= 0 , then X0= AXhas a unique equilibrium point (0,0). Proof. An equilibrium point X = (x;y) of the system X0= AX is a point that satis es AX= 0. We know from linear algebra that this system has a nontrivial
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www-users.cse.umn.edu › ~olver › ln_Nonlinear OrdinaryDifferentialEquations by Peter J. Olver University of Minnesota 1. Introduction. These notes are concerned with initial value problems for systems of ordinary dif-ferential equations. Here our emphasis will be on nonlinear phenomena and properties, particularly those with physical relevance. Finding a solution to a ...