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一、定义1 定义在R上的函数f(x),若满足存在一个不为0的常数T,对任意x∈R都有f(x+T)=f(x),则称f(x)是以T为一个周期的周期函数.
A. Definition 1 The function f(x) defined on R, if there is a constant T not equal to 0, and f(x+T)=f(x) for any x∈R, then we call f(x) ) is a periodic function with T as a period.