Spear Operators Between Banach Spaces

Vladimir Kadets, Miguel Martín, Javier Merí, Antonio Pérez (Autoren)

Buch | Softcover

XVII, 164 Seiten

2018 | 1st ed. 2018
Springer International Publishing (Verlag)
978-3-319-71332-8 (ISBN)

Artikel merken

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 L . 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.

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 book will certainly be of interest to all researchers who specialise in Banach space theory.” (Jan-David Hardtke, zbMATH 1415.46002, 2019)

Erscheinungsdatum	18.04.2018
Reihe/Serie	Lecture Notes in Mathematics
Zusatzinfo	XVII, 164 p. 5 illus.
Verlagsort	Cham
Sprache	englisch
Maße	155 x 235 mm
Gewicht	284 g
Themenwelt	Mathematik / Informatik ► Mathematik ► Analysis
Schlagworte	Banach space • Bounded Linear Operator • Daugavet Equation • Daugavet Property, Alternative Daugavet Property • Lipschitz Operator • Lush Space • Numerical Index of Banach Spaces • Numerical Range of Operators • Spear Operator
ISBN-10	3-319-71332-9 / 3319713329
ISBN-13	978-3-319-71332-8 / 9783319713328
Zustand	Neuware