Bertrand's postulate and subgroup growth

Details Bertrand's postulate and subgroup growth Bertrand's postulate and subgroup growth

2009-09-07

arxiv.org/abs/0909.1343v1

Mathematics

Group Theory

33 pages

Scientific paper

In this article we investigate the L^1-norm of certain functions on groups called divisibility functions. Using these functions, their connection to residual finiteness, and integration theory on profinite groups, we define the residual average of a finitely generated group. One of the main results in this article is the finiteness of residual averages on finitely generated linear groups. Whether or not the residual average is finite depends on growth rates of indices of finite index subgroups. Our results on index growth rates are analogous to results on gaps between primes, and provide a variant of the subgroup growth function, which may be of independent interest.

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