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math.FA2023
Linear versus nonlinear forms of partial unconditionality of bases
Fernando Albiac, Jose L. Ansorena, Miguel Berasategui
The main results in this paper contribute to bring to the fore novel underlying connections between the contemporary concepts and methods springing from greedy approximation theory…
math.FA2023
Counterexamples in isometric theory of symmetric and greedy bases
Fernando Albiac, Jose L. Ansorena, Oscar Blasco +2
We continue the study initiated in [F. Albiac and P. Wojtaszczyk, Characterization of -greedy bases, J. Approx. Theory 138 (2006), no. 1, 65-86] of properties related to greedy…