# Spear Operators Between Banach Spaces

Springer (Verlag)
• erschienen am 17. April 2018

• Buch
• |
• Softcover
• |
• XVII, 164 Seiten
978-3-319-71332-8 (ISBN)

This monograph is devoted to the study of spear operators, that is, bounded linear operators G between Banach spaces X and Y satisfying that for every other bounded linear operator T:X ¿ Y there exists a modulus-one scalar ¿ such that ¿ G+¿T¿ = 1 + ¿T¿.This concept extends the properties of the identity operator in those Banach spaces having numerical index one. Many examples among classical spaces are provided, being one of them the Fourier transform on L1. The relationships with the Radon-Nikodým property, with Asplund spaces and with the duality, and some isometric and isomorphic consequences are provided. Finally, Lipschitz operators satisfying the Lipschitz version of the equation above are studied. The book could be of interest to young researchers and specialists in functional analysis, in particular to those interested in Banach spaces and their geometry. It is essentially self-contained and only basic knowledge of functional analysis is needed.
 Produkt-Info: Book Reihe: Auflage: 1st ed. 2018 Sprache: Englisch Verlagsort: Cham | Schweiz Verlagsgruppe: Springer International Publishing Zielgruppe: Für höhere Schule und Studium | Für Beruf und Forschung Illustrationen: 5 s/w Abbildungen | Bibliographie Maße: Höhe: 238 mm | Breite: 154 mm | Dicke: 15 mm Gewicht: 299 gr Schlagworte: ISBN-13: 978-3-319-71332-8 (9783319713328) DOI: 10.1007/978-3-319-71333-5
weitere Ausgaben werden ermittelt
1. Introduction.- 2. Spear Vectors and Spear Sets.- 3. Spearness, the aDP and Lushness.- 4. Some Examples in Classical Banach Spaces.- 5. Further Results.- 6. Isometric and Isomorphic Consequences.- 7. Lipschitz Spear Operators.- 8. Some Stability Results.- 9. Open Problems.
"This book will certainly be of interest to all researchers who specialise in Banach space theory." (Jan-David Hardtke, zbMATH 1415.46002, 2019)
This monograph is devoted to the study of spear operators, that is, bounded linear operators $G$ between Banach spaces $X$ and $Y$ satisfying that for every other bounded linear operator $T:X\longrightarrow Y$ there exists a modulus-one scalar $\omega$ such that$\ G + \omega\,T\ =1+ \ T\$.
This concept extends the properties of the identity operator in those Banach spaces having numerical index one. Many examples among classical spaces are provided, being one of them the Fourier transform on $L_1$. The relationships with the Radon-Nikodým property, with Asplund spaces and with the duality, and some isometric and isomorphic consequences are provided. Finally, Lipschitz operators satisfying the Lipschitz version of the equation above are studied. The book could be of interest to young researchers and specialists in functional analysis, in particular to those interested in Banach spaces and their geometry. It is essentially self-contained and only basic knowledge of functional analysis is needed.
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