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Acknowledgments
We are grateful to the Mathematics Institute of Heidelberg University for providing a stimulating environment, and we are especially grateful to Sergei Tabachnikov for bringing the seven circles theorem to our attention and for inspiring discussions on the topic.
The first-named author was supported by the Advanced Grant “HOLOGRAM” of the European Research Council (ERC). The second-named author was supported by N.S.F. Research Grant DMS-1807320.
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Drach, K., Schwartz, R.E. A Hyperbolic View of the Seven Circles Theorem. Math Intelligencer 42, 61–65 (2020). https://doi.org/10.1007/s00283-019-09952-1
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DOI: https://doi.org/10.1007/s00283-019-09952-1