Big weak open radius versus big slice diameter
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866911216530620416 |
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| author | López-Pérez, Ginés Vañó, Esteban Martínez Zoca, Abraham Rueda |
| author_facet | López-Pérez, Ginés Vañó, Esteban Martínez Zoca, Abraham Rueda |
| contents | We show that there exists a Banach space in which every non-empty weakly open subset of its unit ball has radius one, the maximum possible value, but the infimum of the diameter of its slices is exactly one, so extremely far from its maximum. In fact, we show that there is a wide class of non-isomorphic Banach spaces satisfying this extreme difference between the behaviour of the radius and the diameter of non-empty weakly open subsets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_15461 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Big weak open radius versus big slice diameter López-Pérez, Ginés Vañó, Esteban Martínez Zoca, Abraham Rueda Functional Analysis 46B20, 46B22 We show that there exists a Banach space in which every non-empty weakly open subset of its unit ball has radius one, the maximum possible value, but the infimum of the diameter of its slices is exactly one, so extremely far from its maximum. In fact, we show that there is a wide class of non-isomorphic Banach spaces satisfying this extreme difference between the behaviour of the radius and the diameter of non-empty weakly open subsets. |
| title | Big weak open radius versus big slice diameter |
| topic | Functional Analysis 46B20, 46B22 |
| url | https://arxiv.org/abs/2510.15461 |