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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.05998 |
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| _version_ | 1866910043485503488 |
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| author | Bialy, Misha Tabachnikov, Serge |
| author_facet | Bialy, Misha Tabachnikov, Serge |
| contents | We study outer length billiards; our main results are as follows. We prove 3- and 4-periodic versions of the Ivrii conjecture. We show that, for every period $n\ge 3$, there exists a functional space of billiard tables that possess invariant curves consisting of $n$-periodic points. For $n=4$, we explicitly parameterize such centrally symmetric billiard tables by functions of one variable and describe how to construct these tables geometrically, similarly to the known construction of Radon curves. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_05998 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Remarks on the outer length billiards Bialy, Misha Tabachnikov, Serge Dynamical Systems We study outer length billiards; our main results are as follows. We prove 3- and 4-periodic versions of the Ivrii conjecture. We show that, for every period $n\ge 3$, there exists a functional space of billiard tables that possess invariant curves consisting of $n$-periodic points. For $n=4$, we explicitly parameterize such centrally symmetric billiard tables by functions of one variable and describe how to construct these tables geometrically, similarly to the known construction of Radon curves. |
| title | Remarks on the outer length billiards |
| topic | Dynamical Systems |
| url | https://arxiv.org/abs/2603.05998 |