在国外学经济学PhD，基础课程大半是数学课。想搞经济学数学不好不行啊。
（日子要过，币还是要收点。）
Algebraic Numbers and Fourier Analysis - Salem
An Introduction to Complex Analysis for Engineers - M. Adler
An Introduction To Functional Analysis - Vitali Milman
Analysis - Hyland
Basic Analysis - K. Kuttler
Complex Analysis - Ahlfors
Fourier analysis on groups - Rudin, Walter（经典书籍，受用终生）