Module Handbook

  • Dynamischer Default-Fachbereich geändert auf MAT

Course MAT-40-33-K-4

Character Theory of Finite Groups; Quadratic Number Fields (4V+2U, 9.0 LP)

Course Type

SWS Type Course Form CP (Effort) Presence-Time / Self-Study
- K Lecture with exercise classes (V/U)
4 V Lecture 6.0 CP 56 h 124 h
2 U Exercise class (in small groups) 3.0 CP 28 h 62 h
(4V+2U) 9.0 CP 84 h 186 h


CP, Effort 9.0 CP = 270 h
Position of the semester 1 Sem. irreg. SuSe
Level [4] Bachelor (Specialization)
Language [EN] English
+ further Lecturers of the department Mathematics
Area of study [MAT-AGCA] Algebra, Geometry and Computer Algebra
Additional informations
Livecycle-State [NORM] Active


The course consists of the two parts [MAT-40-25-K-4] and [MAT-40-29-K-4].

Possible Study achievement

  • Verification of study performance: proof of successful participation in the exercise classes (ungraded)
    The certificate for the exercises ("Übungsschein") consists of the two (partial) certificates for the exercises in the courses [MAT-40-25-K-4] and [MAT-40-29-K-4].


Character Theory of Finite Groups:

  • Maschke's theorem,
  • character tables,
  • orthogonality relations,
  • rationality questions,
  • Burnside theorem,
  • induced characters,
  • Frobenius groups.

Quadratic Number Fields:

  • structure of imaginary quadratic number fields,
  • ideals and ideal class groups,
  • Ideals as geometric lattices,
  • finiteness of the ideal class group.

Competencies / intended learning achievements

In the part "Character Theory of Finite Groups", the students have studied the basic terms, propositions and techniques of representation theory through the character theory of finite groups. In particular, they have learnt to work with generic characters and character tables.

In the part "Quadratic Number Fields", the students have studied the extension of a number system through quadratic number fields which is fundamental for number theory. They also have studied the rings contained in quadratic number fields as well as their main properties and some simple applications.


Character Theory of Finite Groups:

  • M. Isaacs: Character Theory of Finite Groups,
  • G. James, M. Liebeck: Representations and Characters of Finite Groups,
  • J. Alperin, R. Bell: Groups and Representations.

Quadratic Number Fields:

  • I.N. Stewart, D.O. Tall: Algebraic Number Theory,
  • M. Trifković: Algebraic Theory of Quadratic Numbers.


Further literature will be announced in the lecture; Exercise material is provided.


Registration for the exercise classes via the online administration system URM (

Requirements for attendance (informal)

Knowledge from the course [MAT-12-21-K-3] is useful but not necessarily required.



Requirements for attendance (formal)


References to Course [MAT-40-33-K-4]

Course-Pool Name
[MAT-40-4V-KPOOL-4] Elective Courses Algebra, Geometry and Computeralgebra (4V, B.Sc.)
[MAT-40-KPOOL-4] Specialisation Algebra, Geometry and Computer Algebra (B.Sc.)