GIT Reading Group

  • Angel David Rios Ortiz (MPI MiS, Leipzig)
  • Clemens Nollau (MPI MiS, Leipzig)
G3 10 (Lecture hall)


Geometric Invariant Theory studies how to construct group quotients in Algebraic Geometry. The motivation behind the construction of such quotients lies in the frame of moduli problems. It provides indeed a method for constructing moduli space. In this reading group we will study the theoretical tools necessary for constructing affine and projective GIT quotients for reductive groups with the final goal of constructing the moduli space of projective hypersurfaces. In particular, we will give an introduction to moduli problems, algebraic groups, algebraic actions, geometric quotients, GIT quotients, etc. We will follow the lecture notes by Victoria Hoskins, from which we will cover section 1-7.

Speakers will be Angel David Rios Ortiz 15:00-16:00 and Clemens Nollau 16:00-17:00.


Main reference: Hoskins, V. (2016). Moduli problems and geometric invariant theory. Lecture Notes, available at


  • Mukai, S., & Shigeru, M. (2003). An introduction to invariants and moduli (Vol. 81). Cambridge University Press.
  • Mumford, D. (1965). Geometric Invariant Theory.
  • Dolgachev, I. (2003). Lectures on invariant theory (No. 296). Cambridge University Press.

Mirke Olschewski

MPI for Mathematics in the Sciences Contact via Mail