Monthly Archives: February 2013

Stephen Fry

Never let it be said that this blog shies away from confronting sacred cows. Today’s target: Stephen Fry. In the video below, Fry tries to have his cake and eat it too — calling out grammar pedants for “showing off … 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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