English

On homeomorphisms and $C^{1}$ maps

General Mathematics 2018-05-01 v1

Abstract

Our purpose in this article is first, following [8], to prove that if α\alpha , β\beta are any points of the open unit disc D(0;1)D(0;1) in the complex plane C{\bf C} and rr, ss are any positive real numbers such that D(α;r)D(0;1){\overline{D}}( \alpha ;r) \subseteq D(0;1) and D(β;s)D(0;1){\overline{D}}( \beta ;s) \subseteq D(0;1), then there exist t(0,1)t \in (0,1) and a homeomorphism h:D(0;1)D(0;1)h : {\overline{D}}(0;1) \rightarrow {\overline{D}}(0;1) such that D(α;r)D(0;t){\overline{D}}( \alpha ;r) \subseteq D(0;t), D(β;s)D(0;t){\overline{D}}( \beta ;s) \subseteq D(0;t), h[D(α;r)]=D(β;s)h \left[ {\overline{D}}( \alpha ;r) \right] = {\overline{D}}( \beta ;s) and h=idh = id on D(0;1)D(0;t){\overline{D}}(0;1) \setminus D(0;t), and second, following [9], to prove that if qN{0,1}q \in {\bf N} \setminus \{ 0, 1 \} and B(0;1){\bf B}({\bf 0};1) is the open unit ball in Rq{\bf R}^{q}, while for any t>0t>0, we set f(t)(x)=tx1+(t1)xf^{(t)}( {\bf x} ) = \frac{ t {\bf x} }{ 1 + (t-1) \Vert {\bf x} \Vert }, whenever xB(0;1){\bf x} \in {\overline{\bf B}}({\bf 0};1), then f(t)idf^{(t)} \rightarrow id in C1(B(0;1),Rq)C^{1} \left( {\overline{\bf B}}({\bf 0};1) , {\bf R}^{q} \right) as t1+t \rightarrow 1^{+}.

Keywords

Cite

@article{arxiv.1804.10691,
  title  = {On homeomorphisms and $C^{1}$ maps},
  author = {Nikolaos E. Sofronidis},
  journal= {arXiv preprint arXiv:1804.10691},
  year   = {2018}
}
R2 v1 2026-06-23T01:38:39.641Z