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Feb 5, 2023 at 1:19 comment added Alexandre Eremenko Some other, more modern books are Maskit, Kleinian groups, and A. Beardon, Geometry of discrete groups. They also contain constructions of fundamental regions. There are two basic constructions: one is called a Ford fundamental region, another Dirichlet fundamental region.
Feb 4, 2023 at 19:49 comment added p6majo I tried to buy the book by Ford. But I can only find it in the US not shipable to Europe. On the other hand, I found the first 25 pages of the book at googlebooks. Within these 25 pages the isometric circle is discussed, which happens to be exactly the border of the two discs $D_1$ and $D_2$ for the example I showed in the question. Can I generalize this observation, that the fundamental domain is $\mathbb{C}$ with the discs removed that are surrounded by the isometric circles of $a$ and its inverse $a^{-1}$? This would be very neat and simple as well.
Feb 3, 2023 at 0:17 comment added Alexandre Eremenko For a general construction of fundamental domain (of any properly discontinuous group of linear-fractional transformation) you may consult the book Ford, Automorphic functions, or any other book on Kleinian groups.
Feb 2, 2023 at 19:05 history edited p6majo CC BY-SA 4.0
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Feb 8, 2023 at 18:27
Feb 2, 2023 at 16:19 history asked p6majo CC BY-SA 4.0