This is the latest gift from Professor Li Yupei, a well-known math popular science writer in China, to middle and high school students-a set of particularly interesting math deductive stories. After reading his book, you can enter the wonderful mathematics paradise with the protagonist in the story, feel the fun of learning mathematics and master the methods of learning mathematics. You will also find that mathematics is not boring, not difficult to learn, it is so magical and wonderful! Let's travel to the kingdom of mathematics.

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. This book is one of its series of mathematical stories, which mainly includes 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.