It is often bilinearform for those integrable systems.
对于其中的可积系统，往往是双线性形式。
2
The nonlinear system as linear system in form is composed of multiplicative control and additive control items in bilinear system using coordinate transformations.
使用坐标变换，将双线性系统中的倍增控制项和叠加控制项重新组合成与线性系统有相同形式的非线性系统。
3
In this paper, we use the theory of symmetric bilinear function to solve problems of quadratic form, and finally give a proof of the inertia theorem.