Working Group on Representation Theory of Locally Compact Groups


Lecturer(s) :

Monod Nicolas




Only this year


Next time: Fall 2019


This Working Group explores the basic representation theory of locally compact groups, especially unitary representations


We will study the basics of representation theory for locally compact groups.


The most important case will be unitary representations on Hilbert spaces, but representations on various Banach spaces also arise naturally in that context, both isometric and uniformly bounded (or beyond).


The fundamental structure theory includes sums and products of representations, decompositions, direct integrals, the notions of equivalence, of irreducibility and of factiriality.


The Haar measure plays a central role in the theory and will be introduced/reviewed.


Highlights of the applications include the Peter-Weyl theorem.


The dictionary between representations of groups and modules over group algebras or measure algebras will be introduced and used. This leads naturally to the notion of C*-algebra.


Related topics are fixed point theorems and amenability; these will be covered according to the taste of the participants.





Representation Theory, Locally Compact Groups, Unitary Representations

Learning Prerequisites

Recommended courses

The participants must have basic knowledge of Topology and Functional Analysis

Learning Outcomes

By the end of the course, the student must be able to:

In the programs

    • Semester
    • Exam form
       Oral presentation
    • Credits
    • Subject examined
      Working Group on Representation Theory of Locally Compact Groups
    • Lecture
      7 Hour(s)
    • Exercises
      14 Hour(s)
    • Practical work
      14 Hour(s)

Reference week

      Exercise, TP
      Project, other


  • Autumn semester
  • Winter sessions
  • Spring semester
  • Summer sessions
  • Lecture in French
  • Lecture in English
  • Lecture in German