The mod 2 cohomology rings of congruence subgroups in the Bianchi groups
Abstract
We provide new tools for the calculation of the torsion in the cohomology of congruence subgroups in the Bianchi groups : An algorithm for finding particularly useful fundamental domains, and an analysis of the equivariant spectral sequence combined with torsion subcomplex reduction.
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With an appendix by Bui Anh Tuan and Sebastian Schönnenbeck
Domains
K-Theory and Homology [math.KT]
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BerkoveLakelandRahmSL2CongruenceSubgroupsCohomology.pdf (644.88 Ko)
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