Tag Archives: Bergeron

Ventotene, Part II

I promised to return to a more mathematical summary of the conference in Ventotene, and indeed I shall do so in the next two posts. One of the themes of the conference was bounding the order of the torsion subgroup … Continue reading

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Torsion in the cohomology of co-compact arithmetic lattices

Various authors (including Bergeron and Venkatesh) have shown that the cohomology of certain arithmetic groups have a lot of torsion. For example, if is a co-compact arithmetic lattice in , and is an acyclic local system, then The proof relies … Continue reading

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