> For the complete documentation index, see [llms.txt](https://www.oulan.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.oulan.com/2021/05/03-fourier-series.md).

# 03, 傅利叶级数

能量，函数\
拉开的大幕\
拆解的频谱\
每个人的劳苦

形状，何如？\
有什么解读？\
思考一次展开\
看聚焦在哪个维度

![](/files/-MZjLvcKVwTtjnxCzkMT)