As we know, perturbed and optimization and variational principle play an important role in nonlinear analysis.

我们知道，扰动优化或变分原理在非线性分析领域中也起到了很大的作用。

youdao

As we know, perturbed and optimization and variational principle play an important role in nonlinear analysis.

我们知道，扰动优化或变分原理在非线性分析领域中也起到了很大的作用。

youdao