Algebraic Number Theory (Springer Undergraduate Mathematics Series)

It was as expected, from the reviews I read.

Very clear and friendly introduction to ANT. It does not assume too much background and can be read by CS Majors who might not have taken a course in Commutative Rings/Modules.

Very readable introduction to the subject. The presentation of the Number Field Sieve is nicely done, the clearest I've seen.

This book has excellent content at a reasonable price.

Chapter9まで読了。代数体の拡大のうち、Ｑ上の拡大のみに絞っているので、ディリクレの単数定理まで比較的早く到達できるが、Ｑ上でない一般の代数体上については他の本で補っていく必要はある。 Chapter5のイデアルの(絶対)ノルムの有限性のあたりで証明が急に不親切に感じられたので、単因子論について載っている他の本を参考にした。 Chapter7のミンコフスキーの理論は証明などでそれまでに比べて色々と不備が感じられた。ノイキルヒの代数的整数論などで補完。 不備は見られるが代数的整数論の導入としては役立ったので☆4つ

Just so we're clear, this is not an introduction to number theory nor is it a textbook on elementary number theory - there are plenty of books elsewhere that will guide the student in that respect. A course in number theory and one in abstract algebra will be of great use to the student wishing to pursue this book.