Refined generic level-curve contact conjecture

Let ϕ\phi satisfy condition (A1). For λT\lambda\in\mathbb{T}, let Lλ(ϕ)\mathcal{L}_{\lambda}(\phi) have LλL_{\lambda} components near (1,1)(1,1), and let Zp~\mathcal{Z}_{\tilde{p}} have L0L_0 branches there. Write the corresponding components as z1=ψλ(z2)z_1=\psi^\lambda_\ell(z_2) and the components for the exceptional value as z1=ψ0(z2)z_1=\psi^0_\ell(z_2). Refined generic level-curve contact conjecture. For almost every pair λ,μT\lambda,\mu\in\mathbb{T},

Lλ=L0=Lμ.L_{\lambda}=L_0=L_{\mu}.

After reordering the components of Lλ(ϕ)\mathcal{L}_{\lambda}(\phi) and Lμ(ϕ)\mathcal{L}_{\mu}(\phi) near (1,1)(1,1), the contact order of z1=ψ0(z2)z_1=\psi^0_\ell(z_2) at (1,1)(1,1) equals the contact order between z1=ψμ(z2)z_1=\psi^\mu_\ell(z_2) and z1=ψλ(z2)z_1=\psi^\lambda_\ell(z_2) at (1,1)(1,1) for 1L01\leq\ell\leq L_0. The preceding argument establishes the analogous lower-bound statement, while this equality and the exact component count remain conjectural.

Sources & referencesView supporting material

Primary source

Kelly Bickel, James Eldred Pascoe and Alan Sola, “Level curve portraits of rational inner functions”, arXiv:1803.04666 (2018).

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