Mathematics – Group Theory
Scientific paper
2006-01-24
Mathematics
Group Theory
A section about periodic groups is added
Scientific paper
We first give a short group theoretic proof of the following result of Lackenby. If $G$ is a large group, $H$ is a finite index subgroup of $G$ admitting an epimorphism onto a non--cyclic free group, and $g$ is an element of $H$, then the quotient of $G$ by the normal subgroup generated by $g^n$ is large for all but finitely many $n\in \mathbb Z$. In the second part of this note we use similar methods to show that for every infinite sequence of primes $(p_1, p_2, ...)$, there exists an infinite finitely generated periodic group $Q$ with descending normal series $Q=Q_0\rhd Q_1\rhd ... $, such that $\bigcap_i Q_i=\{1\} $ and $Q_{i-1}/Q_i$ is either trivial or abelian of exponent $p_i$.
Ol'shanskii Yu. A.
Osin D. V.
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