这是关于Stein’s Fourier Analysis的第2, 3, 5, 6章的笔记. 这是一本优雅的教材, 适合学过数学分析的本科生阅读. 笔记补全了书中的一些证明细节, 并覆盖了相关章节中习题所涉及的要点, 可作为阅读原书时的参考.

On April tenth, 2025, I gave a small talk in Complex Analysis(H)(English), and the second PDF is my draft which includes the third topic in Ch4 and problem 8, Ch5.