Basic number theoryThis book is a typical undergraduate textbook. The topics of cryptology and mass theory, as well as the classical themes of Soulon, cover a great deal. This book is not just another boring textbook, but it is not a boring textbook. Though many textbooks have already been published, it is hard to find a book in which the author s personality is as distinguished as this book. It begins with a historical background on various subjects of Suoron, and is accompanied by a wealth of anecdotes from the recent frieze achievements. Therefore, it maintains the interests of the readers who study the scienology and succeeds in inducing motivation for further study.