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Persistent Recurrence and Inverse Limits of Unimodal Maps

Lori Alvin <lori.alvin@furman.edu>, Furman University

Abstract:

Given a unimodal map, the recurrent critical point $c$ is reluctantly recurrent if there exists a $\delta > 0$ such that for every $\ell\in \mathbb{N}$ there is a backward orbit $\overline{x} = (x_{-\ell},\ldots, x_{-2},x_{-1},x)$ in $\omega(c)$ such that $B(x,\delta)$ has a monotonic pull-back along $\overline{x}$; otherwise we say that $c$ persistently recurrent. Given a unimodal map $f$ with an infinite kneading sequence, it is known that the collection of endpoints for the inverse limit space $\varprojlim {[c_2,c_1],f }$ is precisely the collection of folding points if and only if $c$ is persistently recurrent. We revisit this known result and also show that when $c$ is infinitely recurrent and longbranched, then it is not possible for $c$ to be persistently recurrent.

Scheduled for: 2026-03-12 10:20 AM: Continua Session #3.1 in Heritage Hall Building 106

Icon: video Webinar

Status: Accepted

Collection: Continuum Theory

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