29 citations · 83 across the 18 of their papers we have counts for
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math.CO2011
The contravariant form on singular vectors of a projective arrangement
Michael J. Falk, Alexander N. Varchenko
We define the flag space and space of singular vectors for an arrangement A of hyperplanes in projective space equipped with a system of weights a: A --> C. We show that the contra…
math.GR2011★ 9 cited
Pure braid groups are not residually free
Daniel C. Cohen, Michael Falk, Richard Randell
We show that the Artin pure braid group on at least four strands is not residually free. Our results also show that the pure braid group on at least three strands has corank two.