線性與非線性泛函分析及其應用，作者Philippe G. Ciarlet 。內容全，講解清晰。有中文版。這里提供一個小點的djvu英文版。Philippe G. Ciarlet - Linear and nonlinear functional analysis with applications _ with 401 problems and 52 figures (2013, SIAM-Society for Industrial and Applied Mathematics)