Characterization of the boundary zero set of stable polynomials in $\mathbb B_2$

Abstract

Given a polynomial $p\in \mathbb{C}[z,w]$ whose zeros lie outside the unit ball $\mathbb{B}_2$ of $\mathbb{C}^2,$ we study its local Weierstrass polynomial--obtained via the Weierstrass Preparation Theorem--and provide a strong version of the Nash curve selection lemma. These results lead to a characterization of the intersection of the zero set of $p$ with the unit sphere: $\mathcal{Z}(p)\cap\mathbb{S}_{2}.$