Very badly ordered cycles of interval maps
Abstract
We prove that a periodic orbit with coprime over-rotation pair is an over-twist periodic orbit iff the -linear map has the over-rotation interval with left endpoint equal to the over-rotation number of . We then show that this result fails if the over-rotation pair of is not coprime. Examples of patterns with non-coprime over-rotation pairs are given so that these patterns have no block structure over over-twists but have over-rotation number equal to the left endpoint of the forced over-rotation interval (such patterns are called \emph{very badly ordered}). This presents a situation in which the results about over-rotation numbers on the interval and those about classical rotation numbers for circle degree one maps are different. In the end we elucidate a rigorous description of the strongest unimodal pattern that corresponds to a given over-rotation interval and use it to construct unimodal very badly ordered patterns with arbitrary non-coprime over-rotation pair.
Cite
@article{arxiv.1908.06145,
title = {Very badly ordered cycles of interval maps},
author = {Sourav Bhattacharya and Alexander Blokh},
journal= {arXiv preprint arXiv:1908.06145},
year = {2021}
}
Comments
19 pages, 5 figures; in this version 4 typos are corrected and one figure is improved; to appear in Journal of Difference Equations and Applications