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math.FA2024
On the three-space property for subprojective and superprojective Banach spaces
Manuel González, Javier Pello
We introduce the notion of subprojective and superprojective operators and we use them to prove a variation of the three-space property for subprojective and superprojective spaces…
math.FA2024
The Extreme Points of the Unit Ball of the James space and its dual spaces
Spiros A. Argyros, Manuel González
We provide a new proof of S. Bellenot's characterization of the extreme points of the unit ball of James quasi-reflexive space . We also provide an explicit description of…