This paper describes numerical difference methods for generating derivative spectra.

本文采用数值差分法计算产生各阶导数光谱值。

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The relation between noncentral difference quotients convergence and derivative was discussed by drawing the concept of noncentral difference quotients convergence in this paper.

引入非中心差商极限概念，讨论了非中心差商极限存在与可导的关系，以及对称导数在研究函数性质方面的一些应。

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Thie relationship between divided difference and derivative of a function can be generalized for two functions which the knots are distinct or the knots are coincident.

在结点互异或结点重合时，将函数差商与其导数之间的关系式推广为关于两个函数的情形。

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But the rest of the alleged debt, which relates derivative products called Contracts for Difference (CFDs) used to bet on the price of bank shares, is disputed.

BBC: Fermanagh businessman Sean Quinn declared bankrupt

The biggest difference between the terrestrial form of ATSC and its mobile derivative, however, is that the newcomer uses the robust internet-protocol form of transport.

ECONOMIST: America is finally poised to get mobile television