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math.FA2025
The ball fixed point property in spaces of continuous functions
Antonio Avilés, María Japón, Christopher Lennard +2
A Banach space has the ball fixed point property (BFPP) if for every closed ball and for every nonexpansive mapping , there is a fixed point. We study the B…
math.LO2025
A Banach space with -orthogonal sequences but without -orthogonal elements
Antonio Avilés, Gonzalo Martínez-Cervantes, Alejandro Poveda +1
We prove that the existence of Banach spaces with -orthogonal sequences but without -orthogonal elements is independent of the standard foundation of Mathematics, ZFC. This p…