Lipschitz retractions and complementation properties of Banach spaces

被引:5
|
作者
Hajek, Petr [1 ]
Quilis, Andres [1 ,2 ]
机构
[1] Czech Tech Univ, Fac Elect Engn, Dept Math, Tech 2, Prague 16627 6, Czech Republic
[2] Univ Politecn Valencia, Inst Univ Matemat Pura & Aplicada, Camino Vera S-N, Valencia 46022, Spain
关键词
Lipschitz retractions; Complementation properties of; Banach spaces; SUBSPACES;
D O I
10.1016/j.jfa.2022.109494
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
In the present paper we introduce and study the Lipschitz retractional structure of metric spaces. This topic was motivated by the analogous projectional structure of Banach spaces, a topic that has been thoroughly investigated. The more general metric setting fits well with the currently active theory of Lipschitz free spaces and spaces of Lipschitz functions. Among our applications we show that the Lipschitz free space F(X) is a Plichko space whenever X is a Plichko Banach space. Our main results include two examples of metric spaces. The first one M contains two points {0, 1} such that no separable subset of M containing these points is a Lipschitz retract of M. The second example fails the analogous property for arbitrary infinite density. Finally, we introduce the metric version of the concept of locally complemented Banach subspace, and prove some metric analogues to the linear theory. (c) 2022 Elsevier Inc. All rights reserved.
引用
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页数:35
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