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compacton : ウィキペディア英語版
compacton
In the theory of integrable systems, a compacton, introduced in , is a soliton with compact support.
An example of an equation with compacton solutions is the generalization
: u_t+(u^m)_x+(u^n)_=0\,
of the Korteweg–de Vries equation (KdV equation) with ''m'', ''n'' > 1. The case with ''m'' = ''n'' is the Rosenau–Hyman equation as used in their 1993 study; the case ''m'' = 2, ''n'' = 1 is essentially the KdV equation.
==Example==
The equation
: u_t+(u^2)_x+(u^2)_=0 \,
has a travelling wave solution given by
: u(x,t) = \begin
\dfrac\cos^2((x-\lambda t)/4) & \text|x - \lambda t| \le 2\pi, \\ \\
0 & \text|x - \lambda t| \ge 2\pi.
\end

This has compact support in ''x'', so is a compacton.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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