Geodesic
Burnside structures of finite subgroups
Izvestiya. Mathematics, Tome 71 (2007) no. 5, pp. 939-965 Cet article a éte moissonné depuis la source Math-Net.Ru

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We establish conditions guaranteeing that a group $B$ possesses the following property: there is a number $\ell$ such that if elements $w$, $x^{-1}wx$, $\dots$, $x^{-\ell+1}wx^{\ell-1}$ of $B$ generate a finite subgroup $G$ then $x$ lies in the normalizer of $G$. These conditions are of a quite special form. They hold for groups with relations of the form $x^n=1$ which appear as approximating groups for the free Burnside groups $B(m,n)$ of sufficiently large even exponent $n$. We extract an algebraic assertion which plays an important role in all known approaches to substantial results on the groups $B(m,n)$ of large even exponent, in particular, to proving their infiniteness. The main theorem asserts that when $n$ is divisible by 16, $B$ has the above property with $\ell=6$. 
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     author = {I. G. Lysenok},
     title = {Burnside structures of finite subgroups},
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     url = {http://geodesic.mathdoc.fr/item/IM2_2007_71_5_a2/}
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I. G. Lysenok. Burnside structures of finite subgroups. Izvestiya. Mathematics, Tome 71 (2007) no. 5, pp. 939-965. http://geodesic.mathdoc.fr/item/IM2_2007_71_5_a2/

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