A discrete Morse theory implementation of torsion subcomplex reduction yields the mod 2 Farrell-Tate cohomology of PSL(4,Z).
Bridson and Andr´ e Haefliger, Metric spaces of non-positive curvature , Grundlehren der mathema- tischen Wissenschaften [Fundamental Principles of Mathem atical Sciences], vol
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The 2-torsion in the Farrell--Tate cohomology of PSL(4,Z), and torsion subcomplex reduction via discrete Morse theory
A discrete Morse theory implementation of torsion subcomplex reduction yields the mod 2 Farrell-Tate cohomology of PSL(4,Z).