Mathematics – Group Theory
Scientific paper
2005-04-06
J. Algebra 304 (1) (2006) 190--215.
Mathematics
Group Theory
30 pages; author's name changed to agree with published version; to appear in Journal of Algebra
Scientific paper
Let $\Gamma$ be the fundamental group of a manifold modeled on three dimensional Sol geometry. We prove that $\Gamma$ has a finite index subgroup $G$ which has a rational growth series with respect to a natural generating set. We do this by enumerating $G$ by a regular language. However, in contrast to most earlier proofs of this sort our regular language is not a language of words in the generating set, but rather reflects a different geometric structure in $G$.
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