Lipschitz conjecture for Möbius transformations and the generalized point pair function

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Let Ta:B2→B2T_a:\mathbb{B}^2\to\mathbb{B}^2 be the Möbius transformation

Ta(z)=z−a1−a‾z.T_a(z)=\frac{z-a}{1-\overline{a}z}.

For x,y,a∈B2x,y,a\in\mathbb{B}^2 and α>0\alpha>0, the generalized point pair function conjecture.

11+∣a∣pB2α(x,y)≤pB2α(Ta(x),Ta(y))≤(1+∣a∣)pB2α(x,y).\frac{1}{1+|a|}p^\alpha_{\mathbb{B}^2}(x,y)\leq p^\alpha_{\mathbb{B}^2}(T_a(x),T_a(y))\leq(1+|a|)p^\alpha_{\mathbb{B}^2}(x,y).

Computer tests suggest that the Lipschitz constant of TaT_a for the generalized point pair function is 1+∣a∣1+|a|, independently of α>0\alpha>0, extending analogous conjectures for several intrinsic metrics and quasi-metrics on the unit disk.

References

Primary source

Oona Rainio, “Inequalities for the generalized point pair function”, arXiv:2301.03248 (2023).

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