Duck solutions, a new kind of bifurcation phenomenon, are discovered and studied during the study of singular perturbation equations in the recent decades.
鸭解是近年来在奇异摄动方程的研究中发现并开始研究的。它是一种新的分支现象。
Many equations arising in practical application are singular nonlinear equations, such as bifurcation points, inflexion etc.
在实际应用中，很多问题出现的方程都是奇异非线性方程，如分歧点、折点等。
According to the property of the singular points, we construct a direct methods for Determining the positions of a class of turning simple bifurcation points.
对一类具有转向性质的简单分支点，从方程本身出发，根据奇点的性质，构造出确定奇点位置的直接方法。
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