Dimension-independent quasiconformal distortion conjecture for the hyperbolic distortion function

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Let K>1K>1, n>2n>2, and r∈(0,1)r\in(0,1). Define α=K1/(1−n)\alpha=K^{1/(1-n)} and let φK,n\varphi_{K,n} be the quasiconformal distortion function. Hyperbolic distortion conjecture.

arctanh⁡φK,n(th⁡r)≤2arctanh⁡(φK,2(th⁡12))max⁡{r,rα}.\operatorname{arctanh}\varphi_{K,n}(\operatorname{th} r)\leq2\operatorname{arctanh}\left(\varphi_{K,2}\left(\operatorname{th}\frac12\right)\right)\max\{r,r^\alpha\}.

The conjecture would improve the paper's quasiconformal distortion theorem by replacing the dimension-dependent distortion expression with a bound involving the planar function φK,2\varphi_{K,2}; the supplied text does not indicate that it has been proved or disproved.

References

Primary source

Riku Klén, Matti Vuorinen and Xiaohui Zhang, “Quasihyperbolic metric and Möbius transformations”, arXiv:1108.2967 (2013).

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