The abduction mapping method was introduced to deduce the transformation relation between the non-unbendable surface and the flat surface.
利用微分几何中的诱导映射理论求得非可展曲域内的变换关。
A relatively direct method is expounded in this paper to prove the termwise differentiation of power series, and a simple method is expressed to calculate the Fourier coefficient.
用比较直接的方法幂级数的和函数在收敛域内可以逐项微分的公式;并得了计算傅立叶数的一种简便方法.
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The UN estimates that as many as 500,000 people remain in ISIL-controlled parts of western Mosul.
联合国估计大约还有50由ISIL掌控的西摩苏尔域内。
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