Mathematics – Group Theory
Scientific paper
2011-07-15
Mathematics
Group Theory
9 pages. Syntax corrected; one reference added
Scientific paper
In any connected non-compact semi-simple Lie group without factors locally isomorphic to SL_2(R), there can be only finitely many lattices (up to isomorphism) of a given covolume. We show that there exist arbitrarily large families of pairwise non-isomorphic arithmetic lattices of the same covolume. We construct these lattices with the help of Bruhat-Tits theory, using Prasad's volume formula to control their covolumes.
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