Coarse differentiation of quasi-isometries I: spaces not quasi-isometric to Cayley graphs

Details Coarse differentiation of quasi-isometries I: spaces not quasi-isometric to Cayley graphs Coarse differentiation of quasi-isometries I: spaces not quasi-isometric to Cayley graphs

2006-07-07

arxiv.org/abs/math/0607207v2

Mathematics

Group Theory

41 pages; 3 figures; minor corrections

Scientific paper

In this paper, we prove that certain spaces are not quasi-isometric to Cayley graphs of finitely generated groups. In particular, we answer a question of Woess and prove a conjecture of Diestel and Leader by showing that certain homogeneous graphs are not quasi-isometric to a Cayley graph of a finitely generated group. This paper is the first in a sequence of papers proving results announced in [EFW0]. In particular, this paper contains many steps in the proofs of quasi-isometric rigidity of lattices in Sol and of the quasi-isometry classification of lamplighter groups. The proofs of those results are completed in [EFW1]. The method used here is based on the idea of "coarse differentiation" introduced in [EFW0].

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