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Summer School 2022 - Cohomology, Geometry and Explicit number theory (COGENT)
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Summer School 2022 - Cohomology, Geometry and Explicit number theory (COGENT)

Collection Summer School 2022 - Cohomology, Geometry and Explicit number theory (COGENT)

Organizer(s) Institut Fourier, CNRS, UGA
Date(s) 13/06/2022 - 30/06/2022
linked URL https://if-summer2022.sciencesconf.org/
00:00:00 / 00:00:00
52 55

Coclass theory for nilpotent associative algebras

By Tobias Moede

The coclass of a finite pp-group of order pnpn and class cc is defined as n−cn−c. Using coclass as the primary invariant in the investigation of finite pp-groups turned out to be a very fruitful approach. Together with Bettina Eick, we have developed a coclass theory for nilpotent associative algebras over fields. A central tool are the coclass graphs associated with the algebras of a fixed coclass. The graphs for coclass zero are well understood. We give a full description for coclass one and explore graphs for higher coclasses. We prove several structural results for coclass graphs, which yield results in the flavor of the coclass theorems for finite pp-groups. The most striking observation in our experimental data is that for finite fields all of these graphs seem to exhibit a periodic pattern. A similar periodicity in the graphs for finite pp-groups has been proved independently by du Sautoy using the theory of zeta functions and by Eick & Leedham-Green using cohomological methods. We give an outlook on how a proof might proceed and how the periodicity may be exploited to describe the infinitely many nilpotent associative FF-algebras of a fixed coclass by a finite set of data.

Information about the video

  • Date of recording 20/06/2022
  • Date of publication 03/12/2025
  • Institution Institut Fourier
  • Licence CC BY NC ND
  • Language English
  • Format MP4

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