The book is about Algebra of integers. The book is written in very professional yet a simple and understandable manner. It allows for a broad, deep, and complete understanding of the material. The book has a well-thought-of structure. We hope this book will be useful for many high school students and teachers, as well as for college instructors who teach Learning Mathematics, Elementary Algebra and Intermediate Algebra courses, and their students. This book can also be useful for many others who learn mathematic skills in schools, colleges, tutoring and learning centers, or in any other...