Abstract
In this paper, we establish six necessary and sufficient conditions for a homeomorphism of \(\mathbb {R}^n\) onto itself to be strongly quasisymmetric. These conditions are quantitative in terms of conformal moduli of disjoint continua as well as the geometric modulus, which was recently introduced by Tukia and Väisälä. Note that all of them are equivalent to bilipschitz continuity with parameters depending also on two fixed points. As an application, we obtain several quantitative characterizations for a homeomorphism of the Riemann sphere \(\overline{\mathbb {R}}^n\) onto itself to be strongly quasimöbius.
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Acknowledgements
The authors wish to express their sincere gratitude to the anonymous referee, whose extremely careful reading of the manuscript led to many clarifications and improvements in the text.
Funding
Qingshan Zhou was supported by Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515012441). Antti Rasila was supported by NSF of China (No. 11971124), and NSFs of Guangdong province (Nos. 2021A1515010326, 2024A1515010467). Yuehui He was supported by Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515111136).
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Zhou, Q., Yang, Z., Rasila, A. et al. Modulus Characterizations of Bilipschitz Mappings. J Geom Anal 34, 155 (2024). https://doi.org/10.1007/s12220-024-01635-4
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DOI: https://doi.org/10.1007/s12220-024-01635-4
Keywords
- Bilipschitz mapping
- Modulus
- Geometric modulus
- Ring
- Strongly quasisymmetric mapping
- Strongly quasimöbius mapping