Kourovka Problem 21.147: Non-abelian counterexample for relatively convex subgroups

In a non-abelian right-orderable group, the right-relatively convex subgroups need not form a sublattice of its subgroup lattice.

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Understanding the problem

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In a non-abelian right-orderable group, the right-relatively convex subgroups need not form a sublattice of its subgroup lattice.

Why it matters

Aristotle’s revised construction supplies a non-abelian counterexample to the intended question.

What counts as progress

A specific group theory result with documented AI mathematical work, a stated prior baseline and a checkable source.

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