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Two problems about subgroups of free groups concerning the lengths of their generators

Lucy Koch-Hyde, Éamonn Olive

Source record

Source: arXiv

Published: Aug 31, 2026

arXiv: 2609.00382

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Source abstract

We will answer a problem of Dotsenko that asks for a tight upper bound on the rank of subgroups given a maximum length for its generators. Then, we will use the same tools to answer a longstanding problem of Grigorchuk in the 10th edition of the Kourovka notebook. We accomplish this using Stallings foldings and simple graph theory.

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