Abstract
A quasisymmetric homeomorphism defines an element of the universal Teichmüller space and a symmetric one belongs to its little subspace. We show an example of a symmetric homeomorphism h of the real line \({\mathbb {R}}\) onto itself such that \(h^{-1}\) is not symmetric. This implies that the set of all symmetric self-homeomorphisms of \({\mathbb {R}}\) does not constitute a group under the composition. We also consider the same problem for a strongly symmetric self-homeomorphism of \({\mathbb {R}}\) which is defined by a certain concept of harmonic analysis. These results reveal the difference of the sets of such self-homeomorphisms of the real line from those of the unit circle.
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H. Wei: Research supported by the National Natural Science Foundation of China (Grant No. 11501259).
K. Matsuzaki: Research supported by Japan Society for the Promotion of Science (KAKENHI 18H01125)
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Wei, H., Matsuzaki, K. Symmetric and strongly symmetric homeomorphisms on the real line with non-symmetric inversion. Anal.Math.Phys. 11, 79 (2021). https://doi.org/10.1007/s13324-021-00510-7
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DOI: https://doi.org/10.1007/s13324-021-00510-7
Keywords
- Quasisymmetric
- Symmetric homeomorphism
- Asymptotically conformal
- Characteristic topological subgroup
- Strongly symmetric
- VMO