More generally, this is the core idea  that underlies Fourier transforms, and Fourier series, and the infinite  swell of topics that follow from those.

更一般， 是傅里叶变换和傅里叶级数的核心思想，及随而来的无穷无尽的主题。

A number one bigger than this was in the series expansion of a fundamental function in a totally different part of math, relevant to these things called modular forms and elliptic functions.

更大的一个是数学中完全不同部分的基本函数的级数展开，与模形式和椭圆函数相关。