.png){kind=icon}
.png){kind=icon}
Return
THICK-THIN NON-AUTONOMOUS JULIA SETS
.png){kind=icon}
PRE
AI
DOI：10.3934/dcds.2026014.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Hereditarily non-uniformly perfect (HNUP) sets were introduced by Stankewitz, Sugawa, and Sumi in [20], who gave several examples of such sets based on Cantor set-like constructions using nested intervals. For non-autonomous iteration where one considers compositions of polynomials from a sequence which is in general allowed to vary, the Julia set is uniformly perfect for all sequences with suitably bounded coefficients, while Comerford, Stankewitz, and Sumi showed in [9] that for certain sequences of polynomials with unbounded coefficients, it is possible to have Julia sets which are HNUP. In this manuscript, we give an example of a non-autonomous polynomial sequence whose Julia sets lie in between these two extremes in that they are not uniformly perfect, but also not HNUP. In addition, we show that these Julia sets can be expressed as a 'thick-thin' decomposition consisting of a F sigma subset which is a countable union of uniformly perfect sets and a G delta subset which is HNUP.
Keywords:
Uniformly perfect sets
hereditarily non uniformly perfect sets
non-autonomous iteration
Journal
D
IF:
1.1
Papers:
98
Citations:
0