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3.53 (1969)

Solved

Let $L(\mathfrak{N}_4)$ denote the lattice of subvarieties of the variety $\mathfrak{N}_4$ of nilpotent groups of class at most 4. Is $L(\mathfrak{N}_4)$ distributive?

Contributor: D. M. Smirnov

Progress

No (Yu. A. Belov, Algebra and Logic, 9 (1970), 371–374).

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