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math.GR2010★ 22 cited
Quantifying residual finiteness of arithmetic groups
Khalid Bou-Rabee, Tasho Kaletha
The normal Farb growth of a group quantifies how well-approximated the group is by its finite quotients. We show that any S-arithmetic subgroup of a higher rank Chevalley group G h…
math.GR2010
Generalizing Magnus' characterization of free groups to some free products
Khalid Bou-Rabee, Brandon Seward
A residually nilpotent group is \emph{-parafree} if all of its lower central series quotients match those of a free group of rank . Magnus proved that -parafree groups of…