... 二向分类；二向分组 two-way classification 双向差分；二重差分 two-way difference 类型；型；序型 type ...
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基于使双向差分误差最小的准则，利用最小二乘原理，本文导出了估计灰色模型参数的一种新计算格式。
On the basis of minimum of bilateral difference errors, a new calculating scheme is deduced for estimating parameters in grey modelling by means of least square.
这是首次研究差分方程的双向渐近解的存在性并获得了满意的研究成果。
This is the first time to discuss homoclinic solutions for difference equations, some satisfactory results are obtained.
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