Groups with free regular length functions in Z^n

Details Groups with free regular length functions in Z^n Groups with free regular length functions in Z^n

2009-07-14

arxiv.org/abs/0907.2356v2

Mathematics

Group Theory

40 pages

Scientific paper

This is the first paper in a series of three where we take on the unified theory of non-Archimedean group actions, length functions and infinite words. Our main goal is to show that group actions on Z^n-trees give one a powerful tool to study groups. All finitely generated groups acting freely on -trees also act freely on some Z^n-trees, but the latter ones form a much larger class. The natural effectiveness of all constructions for $Z^n-actions (which is not the case for R-trees) comes along with a robust algorithmic theory. In this paper we describe the algebraic structure of finitely generated groups acting freely and regularly on Z^n-trees and give necessary and sufficient conditions for such actions.

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