With the help of the ping-pong lemma it is proved that some 2-generated subgroups of the group of infinite unitriangular integer matrices are free. Some of these examples are similar to the celebrated examples by W. Hołubowski (2003).
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W. Hołubowski, “Free subgroups of the group of infinite unitriangular matrices,” Internat. J. Algebra Comput., 13, No. 1, 81–86 (2003).
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Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 484, 2019, pp. 55–58.
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Generalov, A.I., Mironov, A.S. On Embeddings of the Free Group into the Group of Infinite Unitriangular Matrices. J Math Sci 252, 782–783 (2021). https://doi.org/10.1007/s10958-021-05198-5
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DOI: https://doi.org/10.1007/s10958-021-05198-5