The finiteness conjecture for large Fatou components of polynomials

From papers

Let f:CCf:\mathbb{C}\to\mathbb{C} be a polynomial, and let a Fatou component mean a connected component of the Fatou set of ff. For ϵ>0\epsilon>0, measure diameters in the usual Euclidean metric on C\mathbb{C}. Finiteness conjecture. For every ϵ>0\epsilon>0, there are at most finitely many Fatou components of ff with diameters greater than ϵ\epsilon. This conjecture proposes that Fatou components of a polynomial become uniformly small apart from finitely many exceptions at every positive scale; the surrounding discussion highlights difficulties caused by irrationally neutral cycles and Cremer points, and no resolution is supplied here.

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Sources & referencesView supporting material

Primary source

Jinsong Zeng, “Most Fatou and Julia components are small for polynomials”, arXiv:2507.08471 (2025).

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