Geometric group theory and arithmetic diameter

Details Geometric group theory and arithmetic diameter Geometric group theory and arithmetic diameter

2011-01-04

arxiv.org/abs/1101.0786v2

Mathematics

Number Theory

7 pages. Minor editorial changes and corrected typos

Scientific paper

Let X be a group with identity e, let A be an infinite set of generators for X, and let (X,d_A) be the metric space with the word metric d_A induced by A. If the diameter of the space is infinite, then for every positive integer h there are infinitely many elements x in X with d_A(e,x)=h. It is proved that if P is a nonempty finite set of prime numbers and A is the set of positive integers whose prime factors all belong to P, then the diameter of the metric space (\Z,d_A) is infinite. Let \lambda_A(h) denote the smallest positive integer x with d_A(e,x)=h. It is an open problem to compute \lambda_A(h) and estimate its growth rate.

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