[http://en.wikipedia.org/wiki/Nonlinear Nonlinear equations] and [[functions]] are of interest to [[physicists]] and mathematicians because they can be used to represent many natural [[phenomena]], including [[chaos]].[http://en.wikipedia.org/wiki/Linear] | [http://en.wikipedia.org/wiki/Nonlinear Nonlinear equations] and [[functions]] are of interest to [[physicists]] and mathematicians because they can be used to represent many natural [[phenomena]], including [[chaos]].[http://en.wikipedia.org/wiki/Linear] |