Abstract
We characterise (residually-finite) groups which possess less than n subgroups of index n for almost all n ∈ ℕ.
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Klopsch, B. Groups with less than n subgroups of index n. Math. Ann. 333, 67–85 (2005). https://doi.org/10.1007/s00208-005-0665-z
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DOI: https://doi.org/10.1007/s00208-005-0665-z