On ω*-basic sequences and their applications to the study of Banach spaces
W. Johnson, H. Rosenthal (1972)
Studia Mathematica
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W. Johnson, H. Rosenthal (1972)
Studia Mathematica
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Manuel Valdivia (1997)
Revista Matemática de la Universidad Complutense de Madrid
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Stefan Heinrich (1982)
Studia Mathematica
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Kazuyuki Saitô (1986)
Studia Mathematica
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Jesús Ferrer, Marek Wójtowicz (2011)
Open Mathematics
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Let X, Y be two Banach spaces. We say that Y is a quasi-quotient of X if there is a continuous operator R: X → Y such that its range, R(X), is dense in Y. Let X be a nonseparable Banach space, and let U, W be closed subspaces of X and Y, respectively. We prove that if X has the Controlled Separable Projection Property (CSPP) (this is a weaker notion than the WCG property) and Y is a quasi-quotient of X, then the structure of Y resembles the structure of a separable Banach space: (a)...
Godefroy, Gilles (2000)
Serdica Mathematical Journal
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We survey several applications of Simons’ inequality and state related open problems. We show that if a Banach space X has a strongly sub-differentiable norm, then every bounded weakly closed subset of X is an intersection of finite union of balls.
Jorge Mújica (1997)
Revista Matemática de la Universidad Complutense de Madrid
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In this survey we show that the separable quotient problem for Banach spaces is equivalent to several other problems for Banach space theory. We give also several partial solutions to the problem.
J. Lindenstrauss, A. Pełczyński (1968)
Studia Mathematica
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M. Valdivia (1977)
Studia Mathematica
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C. Bessaga (1964)
Fundamenta Mathematicae
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A. Pełczyński (1971)
Studia Mathematica
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