Yousef Yousefi, Khikmat Kh. Muminov
In this report, fundamental educational concepts of linear and non-linear equations and solutions of nonlinear equations is given. There are a few ways to classify solitons. For example, there are topological and nontopological solitons. Independently of the topological nature of solitons, all solitons can be divided into two groups by taking into account their profiles: permanent and timedependent. For example, kink solitons have a permanent profile (in ideal systems), while all breathers have an internal dynamics, even, if they are static. So, their shape oscillates in time. The third way to classify the solitons is in accordance with nonlinear equations which describe their evolution. Here we discuss common properties of solitons on the basis of the four classification.
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http://arxiv.org/abs/1206.1294
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