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2.66 (1966)

Solved

Is an $R$-group determined by its subgroup lattice? Is every lattice isomorphism of $R$-groups induced by a group isomorphism?

Contributor: L. E. Sadovskiĭ

Progress

Not always, in both cases (A. Yu. Olshanskii, C. R. Acad. Bulgare Sci., 32, no. 9 (1979), 1165–1166).

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