由于阿罗不可能性定理的提出，西方社会福利函数理论的研究进入了困惑时期；
With the rise of Arrow's impossibility theorem research in social welfare function in the West enters a stage of perplexity.
森对阿罗不可能性定理挑战的回应和最近的艾利亚斯不可能性定理。
Sen's response and challenge to Arrow's impossibility and Alias' recent impossibility theorem.
另外，网络图与相对运动图解法结合得出了求解二自由度平面机构速度瞬心的一种可行方法，这类机构的速度瞬心单纯采用三心定理是不可能求解的。
In addition a feasible method of finding out velocity instant centers of plane mechanisms for two degrees of freedom can be obtained by means of combining net gr...
另外，网络图与相对运动图解法结合得出了求解二自由度平面机构速度瞬心的一种可行方法，这类机构的速度瞬心单纯采用三心定理是不可能求解的。
In addition a feasible method of finding out velocity instant centers of plane mechanisms for two degrees of freedom can be obtained by means of combining net gr...
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