Mathematics Book: (1) Popular Science: The Magic of Mathematics —— (America) The Source and Flow of Mathematics by Calvin Claughton —— Author: Zhang's wonderful mathematics garden series, ancient and modern mathematics thoughts (2) Problem-solving category: mathematical thinking technology —— Author: Ji's Preschool Education and Mathematical Discovery of Mathematical Beauty —— Author: Xu Xiao. Editor: Shen Wenxuan Yao Qingyang (4) Interest category: physical methods, mathematical curiosity and mathematical kaleidoscope in solving mathematical problems. Physics works: marginal miracle: phase transition and critical phenomena, qualitative and semi-quantitative physics and introduction to solid state physics.