Approximation of rearrangements by polarizations
Fuente:
arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866911134062215168 |
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| author | Bianchi, Gabriele Gardner, Richard J. Gronchi, Paolo Kiderlen, Markus |
| author_facet | Bianchi, Gabriele Gardner, Richard J. Gronchi, Paolo Kiderlen, Markus |
| contents | The symmetric decreasing rearrangement of functions on $\mathbb{R}^n$ features in several seminal inequalities, such as the Pólya-Szegő inequality. The latter was shown by the authors to hold for all smoothing rearrangements, a class that includes the more general $(k,n)$-Steiner rearrangement, as well as others introduced by Brock and by Solynin. The theory of rearrangements and their associated set maps is developed, with an emphasis on approximation, particularly by polarizations. The Pólya-Szegő inequality holds with equality for polarizations, so is proved relatively easily for rearrangements that can be suitably approximated by them. One goal here is to show that the Brock rearrangements cannot be approximated in such a way. It turns out that under mild conditions, each set map associated with a rearrangement has in turn an associated contraction map from $\mathbb{R}^n$ to $\mathbb{R}^n$. With this new analytical tool, several general results on the approximation of rearrangements are also proved. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02162 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Approximation of rearrangements by polarizations Bianchi, Gabriele Gardner, Richard J. Gronchi, Paolo Kiderlen, Markus Functional Analysis Metric Geometry Primary: 28A20, 52A20, secondary: 46E30, 52A38 The symmetric decreasing rearrangement of functions on $\mathbb{R}^n$ features in several seminal inequalities, such as the Pólya-Szegő inequality. The latter was shown by the authors to hold for all smoothing rearrangements, a class that includes the more general $(k,n)$-Steiner rearrangement, as well as others introduced by Brock and by Solynin. The theory of rearrangements and their associated set maps is developed, with an emphasis on approximation, particularly by polarizations. The Pólya-Szegő inequality holds with equality for polarizations, so is proved relatively easily for rearrangements that can be suitably approximated by them. One goal here is to show that the Brock rearrangements cannot be approximated in such a way. It turns out that under mild conditions, each set map associated with a rearrangement has in turn an associated contraction map from $\mathbb{R}^n$ to $\mathbb{R}^n$. With this new analytical tool, several general results on the approximation of rearrangements are also proved. |
| title | Approximation of rearrangements by polarizations |
| topic | Functional Analysis Metric Geometry Primary: 28A20, 52A20, secondary: 46E30, 52A38 |
| url | https://arxiv.org/abs/2509.02162 |