trigonometric series meaning in English

三角级数

Remarks on a new condition for the convergence of certain trigonometric series
级数收敛性问题一个新条件的注记
In this paper , by using the property of fourier series a compound series consisting of trigonometric series and power series is established
摘要利用由三角级数和幂级数复合构成的函数项级数的有关性质，得到了一类变系数非齐次调和方程边值问题的级数解。
The main achievements of this work include the some aspects as follows : ( 1 ) based on a simple model with constant number of parameters , which consists of a set of trigonometric series functions , a generalized ionospheric model is constructed whose parameters can be adjusted
主要包括： ( 1 )将参数固定的三角级数函数电离层模型，扩展为更适用于理论研究和实际应用的参数可调型广义形式，实现了根据电离层延迟时空变化特征，选择不同的特征参数模拟电离层延迟的影响。