preprint-author: 
Jeremy Kahn, Misha Lyubich
preprint-title: 
A priori bounds for some infinitely renormalizable quadratic: IV. Elephant Eyes
preprint-abstract: 

In this paper we prove a priori bounds for an ``elephant eye'' combinatorics. Little  -copies specifying these combinatorics are allowed to converge to the cusp of the Mandelbrot set. To handle it, we develope a new geometric tool: uniform thin-thick decompositions for bordered Riemann surfaces.

Submitted 29 January, 2026; originally announced January 2026.

arXiv:2601.21905

preprint-year: 
2026