This paper applies the base transformation invertor space and gives a new solution to the common item equation of finite series.

应用向量空间的基变换，给出了一种求有穷数列通项公式的新方法。

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Item parceling, parcel, structural equation model.

项目组合项目小组结构方程模型。

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The total variation constraint item is added to the wave equation inversion objective functional, to improve the stability and the resolution of inversion.

将波动方程反演的目标泛函加入全变差约束项，提高反演过程的稳定性和反演结果的分辨率。

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It changes the equation, however, if she thinks she might want to buy a big-ticket item like a house in the not-too-distant future.

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