Onthe other hand, with traditional iterations and the conjugate gradient(CG) as smoothers, we can show the optimal convergence rate of the cascadic method in energy norm for 1-D and 2-D cases.

另一方面，采用传统迭代子和共轭梯度法作为光滑子，我们证明了瀑布型多重网格法对一、二维非线性椭圆边值问题，在能量范数下，均可获得最优收敛阶。

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The stability and the optimal rate of convergence of the method are proved.

方法的稳定性和最优收敛率也得到证明。

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Its rates of convergence in interior points equal the optimal rate convergence for estimating nonparametric function.

它在内点处的收敛速度达到了非参数函数估计的最优收敛速度。

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An optimal currency area would require convergence on monetary, fiscal, exchange rate, and political policies, which in turn would lead to productivity and growth rate convergence, explained Roubini.

FORBES: Roubini Warns Of Euro Break Up As Greek Credit Rating Tumbles