# Elementary Number Theory by Underwood Dudley | Summary and Q&A

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April 22, 2024
by
The Math Sorcerer
Elementary Number Theory by Underwood Dudley

## TL;DR

Number theory is an interesting subject that can be learned through self-study but may be challenging without proof writing skills.

## Key Insights

• ✍️ Number theory can be learned through self-study, although having proof writing skills is recommended.
• 📔 "Elementary Number Theory" by Underwood Dudley is a recommended book for self-study in number theory, as it covers various topics and provides answer resources.
• 🤝 Number theory deals with the properties of integers and is valued for its fascinating and surprising results.
• 📔 The book covers standard topics in number theory, such as divisibility, congruences, quadratic reciprocity, and Pythagorean triangles.
• 🤑 Different exercises and problems are included in the book, with answers and explanations provided for selected ones.
• 🥡 Number theory courses are often elective in college, but taking a course in the subject is recommended if given the opportunity.
• #️⃣ Proof writing is an essential skill in number theory, and learning how to write elegant proofs contributes to understanding the subject better.

## Transcript

number theory is a very interesting subject that you can learn on your own once you know how to write proofs you can try to learn it on your own without proof writing skills but you're going to have a hard time even then even when you know how to write proofs it's honestly still pretty tough to learn on your own and I speak from experience because ... Read More

### Q: Can number theory be learned through self-study?

Yes, number theory can be learned through self-study, but it may be challenging without proof writing skills. The author of the content shares their personal experience of learning number theory without taking a formal course on the subject.

### Q: Is "Elementary Number Theory" a recommended book for self-study?

Yes, "Elementary Number Theory" by Underwood Dudley is recommended as a helpful resource for self-study in number theory. The book covers various topics in number theory and provides answers to selected exercises.

### Q: What are some topics covered in the book?

The book covers topics such as integers, unique factorization, congruences, modular arithmetic, quadratic congruences, and theorems like Euler's theorem and Fermat's theorem. It also includes sections on Pythagorean triangles, infinite descents, and the sum of squares.

### Q: Are there answers and explanations provided for the exercises in the book?

Yes, the book includes answers to selected exercises and comments on some of the odd-numbered problems. It also provides additional problems and computer problems for further practice.

## Summary & Key Takeaways

• The content discusses the author's experience with learning number theory through self-study and the value of the subject.

• The reviewed book, "Elementary Number Theory" by Underwood Dudley, is highlighted as a helpful resource for studying number theory.

• The book covers standard topics in number theory, such as integers, divisibility, congruences, and quadratic reciprocity.