Thompson-like characterization of the solvable radical
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We prove that the solvable radical of a finite group G coincides with the set of elements y having the following property: for any x in G the subgroup of G generated by x and y is solvable. We present analogues of this result for finite dimensional Lie algebras and some classes of infinite groups. We also consider a similar problem for pairs of elements.
13 pages; completely revised and extended version
13 pages; completely revised and extended version