e/Phase plane method

Information
has gloss	eng: In the context of nonlinear system analysis, the phase plane method refers to graphically determining the existence of limit cycles. The phase plane, applicable for second order systems only, is a plot with axes being the values of the two state variables, x_2 vs. x_1. Vectors representing the derivatives [f_2(x_1,x_2),f_1(x_1,x_2)] at representative points are drawn. With enough of these arrows in place the system behavior over the entire plane can be visualized and limit cycles can be easily identified.
lexicalization	eng: phase plane method
instance of	(noun) an equation containing differentials of a function differential equation

Meaning
French
has gloss	fra: Dans le domaine de létude des systèmes non-linéaires, la méthode du plan de phase désigne une technique qui consiste à déterminer graphiquement lexistence de cycles limites. Le plan de phase, applicable uniquement aux systèmes du second ordre, est un tracé dont les axes sont les valeurs que prennent les deux variables détats, x_1 et x_2 cest-à-dire x_2 = f(x_1).
lexicalization	fra: Methode du plan de phase
lexicalization	fra: Méthode du plan de phase
Polish
lexicalization	pol: Metoda płaszczyzny fazowej