Moreover equations of degree higher than quartic often arise in equilibrium calculations.
况且，在平衡计算中常常发生比四次方程还高的高次方程。
The qualitative theory of ordinary differential equations and numerical simulation method are employed to investigate the kink waves of a nonlinear quartic equation.
用微分方程定性理论结合数值模拟方法研究了一类非线性四阶波动方程的纽结波。
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