The article expounds the nature of periodic function and proves the existence of the base period of the continuous periodic function.
本文给出了周期函数的几个性质，并证明了连续的周期函数基本周期的存在性。
The article expounds the nature of periodic function and proves the existence of the base period of the continuous periodic function.
本文给出了周期函数的几个性质，并证明了连续的周期函数基本周期的存在性。
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