Lie Methods in Growth of Groups and Groups of Finite Width

By Laurent Bartholdi, Rostislav I. Grigorchuk. 2000

66 citations recorded by the source corpus.

In the first, mostly expository, part of this paper, a graded Lie algebra is associated to every group G given with an N-series of subgroups. The asymptotics of the Poincare series of this algebra give estimates on the growth of the group G. This establishes the existence of a gap between polynomial growth and growth of type $e^{sqrt n}$ in the class of residually-p groups, and gives examples of finitely generated p-groups of uniformly exponential growth. In the second part, we produce two examples of groups of finite width and describe their Lie algebras, introducing a notion of Cayley graph for graded Lie algebras. We compute explicitly their lower central and dimensional series, and outline a general method applicable to some other groups from the class of branch groups. These examples produce counterexamples to a conjecture on the structure of just-infinite groups of finite width.

Subfields: Discrete Mathematics and Combinatorics, Geometry and Topology, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/c83bc09192ff6b3b49fc7c0d0a62bd5459a3fc9e

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In Discrete Mathematics and Combinatorics

In Geometry and Topology

Citations in the corpus

Dimension and randomness in groups acting on rooted trees (2002, background): “Bartholdi and Grigorchuk (2000) calculated that it has Hausdorff dimension 5/8.”