**Aim of the course**

**Prerequisites**

Undergraduate algebra, i.e., the basic properties of groups, rings, and fields, including Galois theory. This material is covered in first and second year algebra courses in the bachelor program of most universities. See http://websites.math.

**Rules about Homework/Exam**

The final grade will be a weighted average of the homework grade (25%) and the final exam (75%). For students who retake the final exam, the exam counts for 100% of the final grade, and homework performance will not be taken into account. Your homework grade is the average of your 10 best homework sets, and your exam grade should be at least 5 out of 10. If you volunteer to present your solutions in class, your average will be computed based on your 9 best homework sets.

**Lecture notes/Literature**

The course notes "Number rings", which include the exercises from which the homework will be taken, are among those available at the Leiden algebra website http://websites.math.

**Lecturers**

Eugenia Rosu, Peter Stevenhagen, and Jan Vonk

- Docent: Felix Kalker
- Docent: Alexander Molyakov
- Docent: Eugenia Rosu
- Docent: Jan Vonk