English

On Zalcman's and Bieberbach conjectures

Complex Variables 2026-01-16 v1

Abstract

The well-known Zalcman conjecture, which implies the Bieberbach conjecture, states that the coefficients of univalent functions f(z)=z+2anznf(z) = z + \sum\limits_2^{\infty} a_n z^n on the unit disk satisfy an2a2n1(n1)2|a_n^2 - a_{2n-1}| \le (n-1)^2 for all n>2n > 2, with equality only for the Koebe function and its rotations. The conjecture was proved by the author for n6n \le 6 (using geometric arguments related to the Ahlfors-Schwarz lemma) and remains open for n7n \ge 7. The main theorem of this paper states that these conjectures are equivalent and provides their simultaneous proof for all n3n \ge 3 combining the indicated geometric arguments with a new author's approach to extremal problems for holomorphic functions based on lifting the rotationally homogeneous coefficient functionals to the Bers fiber space over universal Teichmuller space.

Keywords

Cite

@article{arxiv.2601.10584,
  title  = {On Zalcman's and Bieberbach conjectures},
  author = {Samuel L. Krushkal},
  journal= {arXiv preprint arXiv:2601.10584},
  year   = {2026}
}

Comments

arXiv admin note: text overlap with arXiv:2507.19767

R2 v1 2026-07-01T09:06:15.087Z