Year: 2026
Type: preprint
Abstract: We prove that a Lipschitz-free space $\F(M)$ fails Kwapień's property (K) whenever its underlying metric space $M$ contains a bi-Lipschitz copy of $C\times K$, where $C\subset\R$ is closed with positive measure and $K$ contains a Cantor metric space. Consequently, this holds for every subset of $\R^n$, $n\geqslant2$, whose closure has positive measure, and for a compact planar set of Assouad dimension one. These Lipschitz-free spaces embed into no strongly weakly compactly generated space and no $L_1$-space; in the separable case their duals are not isomorphic to $\ell_\infty$. Combining our result with a decomposition of Aliaga and Medina, we show that $\F(\R^n\times\Z^m)$ is strongly weakly compactly generated if and only if it has (K), and this occurs precisely when $n\leqslant1$. In particular, $\F(\R^2)$ does not embed isomorphically into $\F(\R\times\Z)$, answering a question of Aliaga. The planar examples nevertheless have the Dunford--Pettis property and Pełczyński's property $(V^*)$ and are weakly sequentially complete.
Source: arXiv (Cornell University)
Authors: Kania, Tomasz, Kąkol, Jerzy
Institution: Adam Mickiewicz University in Poznań
Language: English
Topic: Advanced Banach Space Theory
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7224137305