极限换序问题是数学分析中的一个重要问题，贯穿于数学分析的始终，本文结合函数列极限换序问题给出二元函数累次极限换序的相关条件，并给出一些应用。%Exchanging order of limit is an important problem throughout mathematical analysis .In this paper, the condition and application of repeated limit are given by the limit of binary function sequence .
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