2 papers
math.FA2022
Sparse approximation using new greedy-like bases in superreflexive spaces
Fernando Albiac, Jose L. Ansorena, Miguel Berasategui
This paper is devoted to theoretical aspects on optimality of sparse approximation. We undertake a quantitative study of new types of greedy-like bases that have recently arisen in…
math.FA2015
Characterization of 1-quasi-greedy bases
Fernando Albiac, Jose L. Ansorena
We show that a (semi-normalized) basis in a Banach space is quasi-greedy with quasi-greedy constant equal to 1 if and only if it is unconditional with suppression-unconditional con…