文章详细信息 关键词： 二重级数;;累次级数;;判别法 [gap=309]Keywords: double series;iterated series;criterion of convergence
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convergent double series [数] 收敛二重级数
divergent double series [数] 发散二重级数
Doppelreihe double series 二重级数
conditionally convergent double series [数] 条件收敛的二重级数
hilbert double series hilbert二重级数
hilbert ' s double series hilbert二重级数
low tension double series 低张双重造影
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In this paper double series of functions with posititve coefficients are discussed and a natural condition of the convergence is obtained with the aid of matrix methods.
本文利用矩阵方法对二重函数项级数进行讨论，得到了极其自然的收敛条件。
The system could carry on the single-series refrigeration cycle, double-series refrigeration cycle and cascade refrigeration cycle through the designed regulating station.
通过设计的调节站，该装置可以进行单级制冷循环、双级制冷循环以及复叠式制冷循环。
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