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arXiv · 0911.2944

On the degree of rapid decay

Bogdan Nica
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Abstract

A finitely generated group $\G$ equipped with a word-length is said to satisfy property RD if there are $C, s\geq 0$ such that, for all non-negative integers $n$, we have $\|a\|\leq C (1+n)^s \|a\|_2$ whenever $a\in\C\G$ is supported on elements of length at most $n$. We show that, for infinite $\G$, the degree $s$ is at least 1/2.

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Bogdan Nica. 2009-11-16. On the degree of rapid decay. https://arxiv.org/abs/0911.2944

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