Then the new step function space is introduced and stability problem for the finite difference scheme is discussed by means of variational approximation method.

然后引入新的步长函数空间，并在这个空间上，采用变分近似法讨论该格式的稳定性问题。

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Then the new function space is introduced and the stability problem for the finite difference scheme is discussed by means of variational approximation method in this function space.

然后引入新的函数空间，并在这个空间上，采用变分近似法讨论了该格式的稳定性问题。

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Finally, the proposed method is applied to the problem of nonlinear function approximation.

最后将所提出的方法用于解决非线性函数的逼近问题。

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