positive period meaning in English

正周期

Periodic function and its least positive period
周期函数及其最小正周期
Studied periodic function and its least positive period
摘要研究了周期函数及其最小正周期的若干问题。
The whole paper consists of three parts : part is about general theory of the least positive period , which argues the necessary and sufficient condition for the existence of the least positive period for a periodic function , and concludes " the existence of the least positive period for that periodic function , which is continuous at least one point and not equal ever to a constant " ; part researches the least positive period for the sum of two periodic functions , followed its general expression ; part discusses non - periodicity for the compound function constructed by a periodic function and a non - periodic function , and the corresponding results
全文分为三部份：第一部份是关于最小正周期的一般理论，得到了周期函数有最小正周期的充分必要条件，也获得了“至少在一个点连续且不恒等于常数的周期函数必有最小正周期”的结论；第二部份分析了两个周期函数之和的最小正周期的问题，给出了其一般表达式；第三部份讨论了周期函数与某些类型的非周期函数构成的复合函数的非周期性问题，并得出相应结论。