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

更一般地说， 这是傅里叶变换和傅里叶级数思想，及随无穷无尽主题。

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.

比这更大一个是数学中完全不同部分基本函数级数展开，与模形式和椭圆函数相关。