Smooth and Polyhedral Norms via Fundamental Biorthogonal Systems
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Títol
Smooth and Polyhedral Norms via Fundamental Biorthogonal SystemsData de publicació
2022-08-04Editor
Oxford University PressCita bibliogràfica
Dantas, Sheldon, Hájek, Petr, Russo, Tommaso. Smooth and Polyhedral Norms via Fundamental Biorthogonal Systems, International Mathematics Research Notices, Volume 2023, Issue 16, August 2023, Pages 13909–13939Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://academic.oup.com/imrn/article/2023/16/13909/6655610?login=trueVersió
info:eu-repo/semantics/submittedVersionParaules clau / Matèries
Resum
Let X be a Banach space with a fundamental biorthogonal system, and let Y be the dense subspace spanned by the vectors of the system. We prove that Y admits a C∞-smooth norm that locally depends on finitely many ... [+]
Let X be a Banach space with a fundamental biorthogonal system, and let Y be the dense subspace spanned by the vectors of the system. We prove that Y admits a C∞-smooth norm that locally depends on finitely many coordinates (LFC, for short), as well as a polyhedral norm that locally depends on finitely many coordinates. As a consequence, we also prove that Y admits locally finite, σ-uniformly discrete C∞-smooth and LFC partitions of unity and a C1-smooth locally uniformly rotund norm. This theorem substantially generalises several results present in the literature and gives a complete picture concerning smoothness in such dense subspaces. Our result covers, for instance, every weakly Lindelöf determined Banach space (hence, all reflexive ones), L1(μ) for every measure μ, ℓ∞(Γ) spaces for every set Γ, C(K) spaces where K is a Valdivia compactum or a compact Abelian group, duals of Asplund spaces, or preduals of Von Neumann algebras. Additionally, under Martin Maximum MM, all Banach spaces of density ω1 are covered by our result. [-]
Publicat a
International Mathematics Research Notices, Volume 2023, Issue 16, August 2023Entitat finançadora
Agencia Estatal de Investigación (AEI) | Grantová Agentura České Republiky (GAČR) | Istituto Nazionale di Alta Matematica (INdAM)
Codi del projecte o subvenció
PID2019-106529GB-I00/AEI/10.13039/501100011033 | PID2021-122126NB-C33/MCIN/AEI/10.13039/501100011033 | 20-22230L | RVO (67985840)
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