Shumyatsky's conjecture on finite-rank profinite groups with bounded centralizers

Let GG be a profinite group. A profinite group has finite rank if there is an integer rr such that every finitely generated closed subgroup can be generated by at most rr elements. For each nontrivial element gGg\in G, write CG(g)C_G(g) for its centralizer.

Shumyatsky's conjecture. If CG(g)C_G(g) has finite rank for every nontrivial gGg\in G, and GG is not a pro-pp group, then GG has finite rank.

This conjecture concerns the extent to which restrictions on centralizers control the global generation rank of a profinite group. The paper's abstract states a stronger bounded-rank result, but the supplied text does not explicitly state whether this conjecture is thereby resolved.

Sources & referencesView supporting material

Primary source

Pavel Shumyatsky, “On profinite groups in which centralizers have bounded rank”, arXiv:2004.05977 (2022).

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