Li Yupei's Mathematical Story Series (7 volumes in total) (color version): Mathematical Commander, Adventures of Mathematical Kingdom, Mathematical Detective 006, Mathematical Zoo, Mathematical Intelligence, Mathematical Glasses, and Mathematical Journey to the West. Professor Li Yupei is a famous popular science writer in China. He is very good at using children's favorite fairy tales and stories to make abstract and boring mathematics knowledge simple and interesting, so that readers can get in touch with mathematics in interesting stories and enjoy mathematics from now on. As one of its mathematical story series, Li Yupei's mathematical story series (7 volumes in total) mainly contains four stories: the adventure of mathematical glasses, the battle in the castle, the adventure in the black forest and the adventure in the desert town.