Suppose that in every finite even order subgroup F of a periodic group G, the equality [u, x]2 = 1 holds for any involution u of F and for an arbitrary element x of F. Then the subgroup I generated by all involutions in G is locally finite and is a 2-group. In addition, the normal closure of every subgroup of order 2 in G is commutative.
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Supported by RFBR (grants No. 11-01-00456 and 11-01-91158) and by the Federal Program “Scientific and Scientific-Pedagogical Cadres of Innovative Russia” for 2009-2013 (gov. contract No. 14.740.11.0346).
Translated from Algebra i Logika, Vol. 51, No. 3, pp. 321-330, May-June, 2012.
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Lytkina, D.V., Mazurov, V.D. Groups with given properties of finite subgroups. Algebra Logic 51, 213–219 (2012). https://doi.org/10.1007/s10469-012-9184-7
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DOI: https://doi.org/10.1007/s10469-012-9184-7