The full numerator criterion for pure stable polynomials

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Let pp be a pure stable polynomial on H2\mathbb{H}^2, and let p(0,0)=0p(0,0)=0. Using the Puiseux factorization of pp, write the associated product ideal as

I=j=1k(z2+qj(z1),z12Lj)MjR0.\mathcal{I}=\prod_{j=1}^{k}(z_2+q_j(z_1),z_1^{2L_j})^{M_j}R_0.

Here qjq_j, LjL_j, MjM_j, and R0R_0 are the corresponding Puiseux-factorization data and local polynomial ring, and a function is locally HH^{\infty} when it is analytic and bounded on a neighborhood of (0,0)(0,0) intersected with H2\mathbb{H}^2.

Full numerator criterion. For every fC[z1,z2]f\in\mathbb{C}[z_1,z_2], f/pf/p is locally HH^{\infty} if and only if fIf\in\mathcal{I}.

The theorem preceding this conjecture proves the forward implication fIf/pf\in\mathcal{I}\Rightarrow f/p locally HH^{\infty} and the converse under special geometric hypotheses on pp, including a double point, an ordinary multiple point, or repeated segments. The conjecture asserts the converse in general.

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Primary source

Kelly Bickel, Greg Knese, James Eldred Pascoe and Alan Sola, “Local theory of stable polynomials and bounded rational functions of several variables”, arXiv:2109.07507 (2024).

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