Weak limit of W^1,2 homeomorphisms in R^3 can have any degree

In this paper for every \(k\in\mathbb{Z}\) we construct a sequence of weakly converging homeomorphisms \(h_m\colon B(0,10)\to\mathbb{R}^3\), \(h_m\rightharpoonup h\) in \(W^{1,2}(B(0,10))\), such that \(h_m(x)=x\) on \(\partial B(0,10)\) and for every \(r\in(5/16,7/16)\) the degree of \(h\) with respect to the ball \(B(0,r)\) is equal to \(k\) on a set of positive measure.

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Publication Details

Journal
Annales Fennici Mathematici
Published
2024-09-13
DOI
https://doi.org/10.54330/afm.147887
Primary Topic
Advanced Differential Equations and Dynamical Systems
Type
article
Field-Weighted Citation Impact
0.00

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article

Weak limit of W^1,2 homeomorphisms in R^3 can have any degree

Zheng Zhu, Stanislav Hencl, Ondrěj Bouchala
Annales Fennici Mathematici
Advanced Differential Equations and Dynamical Systems
article

Weak limit of W^1,2 homeomorphisms in R^3 can have any degree

Zheng Zhu, Stanislav Hencl, Ondrěj Bouchala
article en

Abstract

In this paper for every \(k\in\mathbb{Z}\) we construct a sequence of weakly converging homeomorphisms \(h_m\colon B(0,10)\to\mathbb{R}^3\), \(h_m\rightharpoonup h\) in \(W^{1,2}(B(0,10))\), such that \(h_m(x)=x\) on \(\partial B(0,10)\) and for every \(r\in(5/16,7/16)\) the degree of \(h\) with respect to the ball \(B(0,r)\) is equal to \(k\) on a set of positive measure.

Annales Fennici MathematiciVol. 49(2)
Charles University (CZ), Department of Mathematical Sciences (RU), Czech Technical University in Prague (CZ), Beihang University (CN)
Univerzita Karlova v Praze, National Natural Science Foundation of China
Openalex Percentile: Top 75%
Advanced Differential Equations and Dynamical Systems
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