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Since their introduction by Dickson, torsion theories have played a key role in the study of abelian categories. Recently, pretorsion theories have been introduced as a “non-pointed version” of torsion theories for general categories. After introducing this framework, in this talk we will investigate pretorsion classes in mod 𝐴 (the category of finitely generated modules over a finite dimensional 𝑘-algebra 𝐴) and study the lattice they form under inclusion. We will analyse when this lattice is distributive and compare it to the widely studied lattice of classic torsion classes in mod 𝐴. This is based on joint work with Federico Campanini and Emine Yıldırım.

Information about the video

  • Date of recording 30/06/2026
  • Date of publication 13/10/2026
  • Institution Institut Fourier
  • Language English
  • Format MP4

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