English

Peano continua with self regenerating fractals

Dynamical Systems 2021-06-22 v3 General Topology

Abstract

We deal with the question of Masayoshi Hata: is every Peano continuum a topological fractal? A compact space XX is a topological fractal if there exists F\mathcal{F} a finite family of self-maps on XX such that X=fFf(X)X=\bigcup_{f\in\mathcal{F}}f(X) and for every open cover U\mathcal{U} of XX there is nNn\in\mathbb{N} such that for all maps f1,,fnFf_1,\dots,f_n\in\mathcal{F} the set f1fn(X)f_1\circ\dots\circ f_n(X) is contained in some set UUU\in\mathcal{U}. In the paper we present some idea how to extend a topological fractal and we show that a Peano continuum is a topological fractal if it contains so-called self regenerating fractal with nonempty interior. A Hausdorff topological space AA is a self regenerating fractal if for every non-empty open subset UU, AA is a topological fractal for some family of maps constant on AUA\setminus U. The notion of self regenerating fractal much better reflects the intuitive perception of self-similarity. We present some classical fractals which are self regenerating.

Keywords

Cite

@article{arxiv.2003.11929,
  title  = {Peano continua with self regenerating fractals},
  author = {Magdalena Nowak},
  journal= {arXiv preprint arXiv:2003.11929},
  year   = {2021}
}

Comments

12 pages, 7 figures, Topol. Appl. (2021)

R2 v1 2026-06-23T14:28:08.680Z