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1.61 (1965)

Solved

Can any orderable group be embedded into an orderable group
$\qquad$ a) with a radicable maximal locally nilpotent normal subgroup?
$\qquad$ b) with a radicable maximal abelian normal subgroup?

Contributor: A. I. Kokorin

Progress

Yes, it can, in both cases (S. A. Gurchenkov, Math. Notes, 51, no. 2 (1992), 129–132).

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