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Santos Rego, Yuri: Finiteness properties of split extensions of linear groups. 2019
Inhalt
Introduction
Presentations of split extensions
The group schemes of Herbert Abels
Parabolic subgroups
A view towards higher dimensions: finiteness length & retracts
Background and preliminaries
Matrices and classical groups
The general linear group and elementary matrices
Unitriangular groups and some commutator calculus
Chevalley–Demazure group schemes
S-arithmetic groups
Basics on the finiteness length
The retraction tool
Proof of Theorem 2.1
Applications
Finite presentability of Herbert Abels' groups
A space for An(R)
Fundamental domain and cell-stabilizers
Connectivity properties
Remarks on the finiteness lengths of Abels' groups
About the proof of Theorem 3.2
Presentations of parabolic subgroups
Structure of parabolics, and the extended Levi factor
Proof of Theorem 4.2
Proof of Theorem 4.10 for I empty
Proof of Theorem 4.10 for I non-empty
Special cases: simply-laced, and S-arithmetic
Concluding remarks, and future directions
Bibliography
List of symbols
Index