The finiteness conjecture for large Fatou components of polynomials

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Let f:C→Cf:\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.

References

Primary source

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

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