Published in Journal of Group Theory, 25(2), 207-216 (2021)
Abstract: We study a family of finitely generated residually finite groups. These groups are doubles $F_2 ∗_H F_2$ of a rank-2 free group $F_2$ along an infinitely generated subgroup $H$. Varying $H$ yields uncountably many groups up to isomorphism.
Link to published paper: https://www.degruyter.com/document/doi/10.1515/jgth-2021-0094/html
Link to arXiv: https://arxiv.org/abs/2207.00410
The associated thesis is linked here. Some of the proofs are simplified and generalised in the submitted paper on the journal.