Abstract
In this chapter, we briefly review well-known facts on circle actions and on (discrete or indiscrete) subgroups of \( \operatorname {\mathrm {PSL}}_2(\mathbb {R})\).
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Kim, Sh., Koberda, T., Mj, M. (2019). Preliminaries. In: Flexibility of Group Actions on the Circle. Lecture Notes in Mathematics, vol 2231. Springer, Cham. https://doi.org/10.1007/978-3-030-02855-8_2
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DOI: https://doi.org/10.1007/978-3-030-02855-8_2
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