... first derived curve 一阶导曲线 first difference operator 一阶差分算子 first difference transformation 一阶差分变换 ...
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...根检定，其检定模型叙述如下：tpΔY=α+βt+kY+γΔY+ε∑tt−1kt−ktk=1其中Δ表示一阶差分运算元（First Difference Operator），α为平均漂浮项（Drift），t为时间趋势项，k为递延期數。
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first-difference operator 表一阶差分运算因子
In this paper, by estimates of spectral of an integral operator, the authors give a theorem on the existence of solutions for first order differential difference equations with boundary condition.
摘要通过对积分算子谱的估计，作者给出了一阶线性微分差分方程在边值条件下解的存在唯一性定理。
In this paper, by estimates of spectral of an integral operator, the authors give a theorem on the existence of solutions for first order differential difference equations with boundary condition.
通过对积分算子谱的估计，作者给出了一阶线性微分差分方程在边值条件下解的存在唯一性定理。
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