Geometric spaceability in sequence classes and operator ideals
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866911439661301760 |
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| author | Albuquerque, Nacib G. Campos, Jamilson R. Sousa, Luiz Felipe P. |
| author_facet | Albuquerque, Nacib G. Campos, Jamilson R. Sousa, Luiz Felipe P. |
| contents | This paper investigates advanced notions of lineability and spaceability within the frameworks of sequence spaces and operator ideals. We propose the notion of \emph{Standard Sequence Classes} to provide an environment that unifies numerous classical sequence spaces while preserving their fundamental behavior. Utilizing this framework, we establish general $(α, \mathfrak{c})$-spaceability results for complements of unions of (quasi-)Banach sequence spaces. These results extend the existing literature by addressing the geometrically more demanding case where $α> 1$ and by encompassing the non-locally convex (quasi-)Banach setting. Furthermore, we provide criteria for the pointwise $\mathfrak{c}$-spaceability of differences between general operator ideals with values in standard sequence spaces. Our results recover and improve several known findings in the context of vector-valued sequences. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_10413 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Geometric spaceability in sequence classes and operator ideals Albuquerque, Nacib G. Campos, Jamilson R. Sousa, Luiz Felipe P. Functional Analysis 47L20, 46B45, 15A03, 46B87 This paper investigates advanced notions of lineability and spaceability within the frameworks of sequence spaces and operator ideals. We propose the notion of \emph{Standard Sequence Classes} to provide an environment that unifies numerous classical sequence spaces while preserving their fundamental behavior. Utilizing this framework, we establish general $(α, \mathfrak{c})$-spaceability results for complements of unions of (quasi-)Banach sequence spaces. These results extend the existing literature by addressing the geometrically more demanding case where $α> 1$ and by encompassing the non-locally convex (quasi-)Banach setting. Furthermore, we provide criteria for the pointwise $\mathfrak{c}$-spaceability of differences between general operator ideals with values in standard sequence spaces. Our results recover and improve several known findings in the context of vector-valued sequences. |
| title | Geometric spaceability in sequence classes and operator ideals |
| topic | Functional Analysis 47L20, 46B45, 15A03, 46B87 |
| url | https://arxiv.org/abs/2602.10413 |