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arXiv · 2610.41568

The role of symmetry in the performance of the Thresholding Greedy Algorithm

José L. Ansorena·Miguel Berasategui·Alejandro Marcos
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Abstract

This paper continues the study of conditional symmetric systems initiated in arXiv:2601.15784 and solves several problems posed there. While the interaction between unconditionality and symmetry is well known in the Banach setting following the work in arXiv:2304.05888 and arXiv:2601.15784, we broaden the scope and address similar questions for spreading systems in the more general setting of quasi-Banach spaces. Our aim is twofold. On the one hand, we characterize which spreading systems of Banach spaces are unconditional. On the other hand, we provide examples of quasi-Banach spaces equipped with conditional systems with symmetry-related properties to illustrate the connections between symmetry, greedy-like properties, and the Schauder basis property in the absence of local convexity.

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José L. Ansorena, Miguel Berasategui, Alejandro Marcos. 2026-10-30. The role of symmetry in the performance of the Thresholding Greedy Algorithm. https://arxiv.org/abs/2610.41568

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