What is Extended Fisher-Kolmogorov (EFK)?
There are many references to it, but I failed to find what is actually is. Is it some kind of non-linear differential equation? Does it describe physical systems?
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Short answer would be:
It is a nonlinear PDE, usually stated as
$$u_t+\gamma u_{xxxx}-u_{xx}-u+u^3=0 $$
as introduced in Dee & van Sarloos' paper. Most authors like to emphasize its application in modeling of phase transitions at critical points.
H. M. Šiljak
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